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QL Edison. fapers
A SELECTIVE MICROFILM EDITION
PART IV (1899-1910) Thomas E. Jeffrey Theresa M. Collins Lisa Gitelman Gregory Field Gregory Jankunis Aldo E. Salerno David W. Hutchings Karen A. Detig Leslie Fields Lorie Stock : . Editors : Robert Rosenberg
Director and Editor i
Sponsors Rutgers, The State University Of New Jersey National Park Service, Edison National Historic Site New Jersey Historical Commission ! Smithsonian Institution |
University Publications of America Bethesda, MD 1999
Edison signature used with permission of McGraw-Edison Company
Thomas A. Edison Papers at Rutgers, The State University endorsed by National Historical Publications and Records Commission 18 June 1981
Copyright © 1999 by Rutgers, The State University ‘os
All rights reserved. No part of this publication including any portion of the guide and index or of the microfilm may be reproduced, stored in a retrieval system, or transmitted in any form by any means—graphic, electronic, mechanical, or chemical, including photocopying, recording or taping, or information storage and retrieval systems—without written permission of Rutgers, The State University, New Brunswick, New Jersey.
The original documents in this edition are from the archives at the Edison National Historic Site at West Orange, New Jersey. :
ISBN 0-89093-703-6
Peotone eT ee ee SEE
THOMAS A. EDISON PAPERS
Robert A. Rosenberg Director and Editor
Thomas E. Jeffrey Associate Director and Coeditor
Paul B. Israel Managing Editor, Book Edition
Helen Endick Assistant Director for Administration
Associate Editors Assistant Editors Theresa M. Collins Louis Carlat Lisa Gitelman Aldo E. Salerno Keith A. Nier Research Associates Secretary Gregory Jankunis Grace Kurkowski Lorie Stock
Student Assistants Amy Cohen Jessica Rosenberg Bethany Jankunis Stacey Saelg Laura Konrad Wojtek Szymkowiak Vishal Nayak Matthew Wosniak
BOARD OF SPONSORS
Rutgers, The State University of New National Park Service
Jersey John Maounis Francis L. Lawrence Maryanne Gerbauckas Joseph J. Seneca Roger Durham Richard F, Foley George Tselos David M. Oshinsky Smithsonian Institution
New Jersey Historical Commission Bernard Finn Howard L. Green Arthur P. Molella EDITORIAL ADVISORY BOARD
James Brittain, Georgia Institute of Technology R. Frank Colson, University of Southampton Louis Galambos, Johns Hopkins University Susan Hockey, University of Alberta Thomas Parke Hughes, University of Pennsylvania Peter Robinson, Oxford University Philip Scranton, Georgia Institute of Technology/Hagley Museum and Library Merritt Roe Smith, Massachusetts Institute of Technology
FINANCIAL CONTRIBUTORS
PRIVATE FOUNDATIONS
The Alfred P. Sloan Foundation Charles Edison Fund
The Hyde and Watson Foundation National Trust for the Humanities Geraldine R. Dodge Foundation
PUBLIC FOUNDATIONS
National Science Foundation
National Endowment for the Humanities
National Historica] Publications and Records Commission
PRIVATE CORPORATIONS AND INDIVIDUALS
Alabama Power Comneny
Anonymous
AT&T
Atlantic Electric
Association of Edison Iuminating Companies
Battelle Memorial Institute
The Boston Edison Foundation
Cabot Corporation Foundation, Inc.
Carolina Power & Light Company
Consolidated Edison Company of New York, Ine.
Consumers Power Company
Cooper Industries
Corning Incorporated
Duke Power Company
Entergy Corporation (Middle South Electric System)
Exxon Corporation
Florida Power & Light Company
General Electric Foundation
Gould Inc. Foundation
Gulf States Utilities Company
David and Nina Heitz
Hess Foundation, Inc.
Idaho Power Company
IMO Industries
International Brotherhood of Electrical Workers
Mr. and Mrs. Stanley H. Katz
Matsushita Electric Industrial Co., Ltd.
- Midwest Resources, Ine.
Minnesota Power
New Jersey Bell
New York State Electric & Gas Corporation
North American Philips Corporation
Philadelphia Electric Company
Philips Lighting B.V.
Public Service Electric and Gas Company
RCA Corporation
Robert Bosch GmbH
Rochester Gas and Electric Corporation
San Diego Gas and Electric
Savannah Electric and Power Company
Schering-Plough Foundation
Texas Utilities Company
Thomas & Betts Corporation
Thomson Grand Public
Transamerica Delaval Inc.
Westinghouse Foundation
Wisconsin Public Service Corporation
A Note on the Sources
The pages which have been filmed are the best copies available. Every technical effort possible has been ‘made to ensure legibility.
PUBLICATION AND MICROFILM COPYING RESTRICTIONS
Reel duplication of the whole or of any part of this film is prohibited. In lieu of transcripts, however, enlarged photocopies of selected items contained on these reels
may be made in order to facilitate research.
OR itis BARN eres Soe, tin bebo 8
Edison Ore Milling Syndicate, Ltd., and Related Companies Standard Construction Corporation, Ltd., Files Correspondence (1903)
This folder contains correspondence and other documents relating to the work of the Standard Construction Corp., Ltd. Most of the letters are to or from Edison and William Simpkin, chief engineer. Included are numerous drafts in Edison's hand. The documents deal mainly with the design and construction of the Dunderland works and operations at the Edison Portland Cement Co. in Stewartsville, New Jersey. Several documents pertain to briquetting, including reports by Simpkin and Professor Henry Louis. Also included are references to Edison's meetings with Simpkin in Florida. Some of the letters are accompanied by drawings.
More than 90 percent of the documents have been selected.
aes . Yourdlernd Conotiuclion Corporalion Limiled,
. a ALL LETTERS SHOULD 68C ADDRESSED :— Litjadan: Tous Bundlel Prect: ENGINEERING DEPARTMENT. ea
TELEGRAMS: STANCOLLI,LONDON. No: 17. January 2, 1903,
Qe ATS Hela
Mr. Hall is mailing you to-day a blue print showing
THOMAS A. EDISON, Esq.
Dear Sir,
the many points in the Crushing Rolls which I think in your interests, and in tle interests of the Syndicate, ought to be protected in this country, as I see nothing in the Patents Specifications which have been handed to me by Capt. Pollen covering some of the specific parts shown on the print and des- cribed in the accompanying specification.
I have only carried this specification out in my ow words, leaving it to the Patent Attorney to. put it into proper form and leaving it to him also to put the claims in, ina proper manner.
If you think I have covered all of the points worth covering, please to cable us and the matter can go forward, but if you have any additions, alterations, or suggestions to make,
kindly let us have these at your convenience.
You will note that I have shown two ways to secure ‘
? the plates to the Roll Centers, ~- one the manner which we are at x
present using, and another showing studs and nuts, not that I think the stud and nut is any better or perhaps not anything like @s good as the manner which we are now using, but it is simply put in to prevent others from using a similar device.
It is not quite certain we the exact day on which I shall leave here to pay my expected visit to you, so I will write | you later or cable woul with reference to this. Trusting you may have a very: happy and prosperous year, I am,
Yours most sincerely,
Ww Awww -
h
Lan devel Consbsuolion Coyporalion Limiled ALL LETTERS SHOULD BE ADDRESSED :— ijalan Meuse undel Svect:
ENGINEERING DEPARTMENT. SE _Londoni woo.
TELEGRAMS: STANCOLLI,LONDON. January 9, 1903. H. E, DICK, Esq.
Dear Mr. Dick,
I have just received your cable saying that Mr. Edison leaves for Florida on the 20th February, for which I am greatly obliged. There are a great many things which I wish to become accomplished facts before I cross and as Mr. Edison will be in Orange up to the 20th of next month I shall delay sailing until the end of this month and this will enable me to complete what I have in hand and also enable me to bring with me a great many more drawings so that I can thoroughly discuss the whole of the layout with Mr. Edison.
I have just returned from Berlin where I have been taking up the matter of the Generators, ete. with Mr. Bergmann.
He has I think written either you or Mr. Edison that the gontract
for this work has been placed in his hands. I am sure that this 3 will be satisfactory news to both of you. This was not done | without a considerable fight as some of our friends here were i very anxious that the contract should be placed in this country [
and particularly one who is very much interested in the British
! pea a Wir hd Se a aN! ae a
Westinghouse - it is not necessary to mention names. However, knowing that you and Mr. Edison were desirous that this contract should go to Mr. Bergmann, if it could possibly be managed and his prices were such that it would not be detrimental in any way to our Company, I took it upon myself to urge this matter very strongly with the result as stated.
There is going to be a big fight over the magnets and when I come over I shall discuss this matter very thoroughly with Mr. Edison and probably have a few suggestions to make which I.think he will agree to. There is one thing in favour of placing the magnets with Mr. Bergmann ani that is it will at once enable us to comply with the German Patent Law by having the magnets manufactured in that country.
When I have decided the exact date on which fT shall ; leave here I will cable Mr. Edison so that you will know when to expect me. “Everything is going on very well and we are making
_ 00d progress,
Yours very truly,
WY Sumpicunr
sw
-
r
ALL LETTERS SHOULD
ENGINEERING DEPARTMENT.
TELEGRAMS:
ae Son bon Conotiuclion Corporalion Limuled
<I e WG.
January 20, 1903.
STANCOLLI,LONDON.
H. E. DIK, Esq.
My dear Mr. Dick,
I have your favour of the 8th-inst. and notice that you will be sailing on the 7th of February. I understand how- ever from Mr. Hall that the other day he received a cable from you in which you said you would arrive here on the 20th February , so from that I take it that you have changed your mind and that I shall see you, as I hope I shall, in Orange before you sail. What is keeping me is this, that I think it absolutely imperative to place the order for. the structural work of the buildings and conveyors before leaving here and take advantage of the now existing low prices. I have been watching the market very carefully all along and in every case so far have been able to come in and tuke advantage of prices and I am satisfied if I had not been able to do this we would have been obliged to pay much more for our work than the prices at which so far I have
been able to make contracts for the work which has already been
let out.
wan NAN FMR ELSES ET oe
I am bringing with me details of everything which I have done so that you and Mr. Edison can go over it with me, and I am satisfied it will meet with the approval of the both of you, I shall leave here on the 3lst inst. or the 4th February and
will cable Mr. Edison the day I sail so that you will know when
to expect me. With best wishes, I am,
Yours very truly,
Sac lt,
4 Of Gy ; Gy nfs Sondra Chon dhitthion Lorforalion: Limeled; ae Yo G ALI LETTERS SHOULD BE ApoRESSEO-— Litpalane Mose; nrdel Heool:
ENGINEERING DEPARTMENT. SL TELeGRams: STANCOLLI, LONDON. ant OW MOU WC.
January 23, 1903.
Dear Mr. Dick,
Replying to your favour of the 13th inst. would say that when I come over I shall have with me the whole of the specifications for all of the work which we have done up to the present, including of course the specifications and guarantees on the motors as I interid to discuss very fully the whole of this with Mr. Edison.
It looks now as if I shall be able to leave sometime between the 3lst and 4th but I cannot tell at this writing as they wish to have a special meeting before I go to give me some instructions of which at present I don't know the Blightest thing.
, Trusting I shall have the pleasure of seeing you in
Orange before you leave, I am,
Yours most sincerely,
WY pinavigltin
| H. E. DICK, Esq.
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ENGINEERING DEPARTMENT. a Se TELEGRAMS: STANCOLLI,LONDON. aL OVWAEOIW, WoC~
No: 18. April 7, 1903.
THOMAS A. EDISON, Esq.
Dear Sir, Since my arrival here last Tuesday I have been very . busy going over the work that had been accomplished ourene my absence. and am now taking up the revision of the drawings of the . Fine Grinding Rolls which we discussed when I was with you in Florida. ‘ | I find that without going to a big expense it is hardly possible to make these Rolls so that we can change at will, the number of sheave pulleys on the ends of the shaft. The Rolls as designed are intended for six ropes, as per your original instructions, and if we arrange these so that eight ropes can be used, you will readily see that it will necessitate | a@& new spreader as the centers of tie take off ropes on each side will be two pulleys wider and also the wield will be changed. With the Rolls at Stewartsville, supposing we have a Pressure of 50 lbs. per square inch in the cylinder, there will be with eight ropes a pressure of 14400 Lbs. on each end of =
itis ese QE Ss
shaft; with the 10 inch cylinder, such as we have designed for Dunderland, with 50 lbs. pressure, there will be with 6 ropes a pressure of 22b201bs. on each end of the shaft, so that we must either decide that the 6 ropes are enough or we must change to 8 ropes and keep it at that.
_ On the Rolls at Stewartsville we have 9/16" ropes with 56" pulleys, and on these for Dunderland we can put #" rope and have arranged for a 48" pulley.
I feel sure that the 6 ropes will be ample for all our
needs as we can readily increase the pressure in the air eylinder if necessary, and will not make any changes on this line
until I hear from you.
With reference to the enlarging of the blocks between the bottom and top girders, - would say that we had already given this matter a good deal of attention. From the rough
sketch herewith you will note that in the Stewartsville Rolls ti
distance between these supporting blocks ig 11 ft. 11¢ in. and | that the blocks are only 10" square - the top girder being secured with only one-bolt passing through .the center.
In making our aesign for the Dunderland Rolls, we have reduced the distance between the blocks to 9 ft. as you will also see on this sketch, and enlarged the ‘size of the blocks to 18" x 15" - being 2 crane in area on the top and bottom surfaces than those at Stewartsville. We have also arranged
that these blocks shall be Secured to the top and bottom girders.
with four separate bolts as well as the large center bolt; at the same time we have increased considerably the strength of the lower and upper girders and anticipate no pinching from the spring of these girders.
I think these blocks are amply large enough and strong enough for anything, and I do not want to increase them as it will interfere considerably with my design for carrying the spreader which carries the take off pulleys, and any change of design such as suggested, i.e. making the lower part of these blocks longer, will of necessity make a design for this spreader and brackets which to my mind will not be anything like as mechanical and satisfactory as the one we now have.
We have given considerable study to this matter and will shortly send you the full details and when you get them I think you will agree with me in all I have written.
On my return here I found that everything had been going along very nicely ,and about the early part of May I éxpect to be in Norway and commence work on the excavations, founda- tions, ete. for the various buildings.
Trusting you are well, I am,
Yours very truly,
[ENCLOSURE]
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if au : Similan LOR MIMAMLOWE Dol potadion. timed: a Ye” VA G ALL LETTERS SHOULD BE ADDRESSED; - Ale ee em Deundel Sect: ENGINEERING DEPARTMENT. ks nS Se TELEGRAMS: STANCOLLI,LONDON, 27°” ’ J at OWMOIL, W.C,
April 8, 1903.
THOMAS A. EDISON, Esq.
/ Dear Sir, I enclose you herewith a description of the direct connected air.compressor of which I was speaking to you. I
have no figures as to the cost of same but shall be pleased to
/ get them for you at any. time. Would say that the machines are |
well built and are giving great satisfaction wherever they are
|
used. }
Yours very truly,
Pxamndehion |
| 2 Enc.
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[ENCLOSURE]
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ENGINEERING DEPARTMENT.
TELEGRAMS: STANCOLLI,LONDON.
Se om LOWMWMONMEG WC, No: 20. : April 9, 1903.
bag tee
7 ae Bee
THOMAS A. EDISON, Esq. —_—_— ole Lee ee ee th siete
[tere et i i fir
Dear Sir, 4 pe ey i
OE Et ee eo Your valued favour of the 30th inst. ‘to hand this ~ a“ morning and very carefully noted. I will take particular care
« that your suggestions are attended to and in this connection
would say that a great many of them have already been taken into consideration in getting out our designs.
With reference to having some arrangement to move the shaft quickly on the Fine Grinding Rolls so as to get in the shear pins, would say that this will be accomplished very readily by our barring mechanism which it is my intention to put on the Pine Grinding Rolls as well as the crushing plant rolls.
I wrote you the other day with reference to the blocks connecting the top and bottom housings of the Fine Grinding Rolls.
I note what you say with reference to the securing of stud bolts and agree with what you say absolutely.
On all conveyor belts we hava arranged to bring up the first idler next the head pulley as high as possible so as to get
more surface for the belt and are using an extra heavy shaft with
the regular self-oiling bearings.
With reference to the gunny chambers for motors, would say that we have no small chambers throughout the plant. In every place where we have a motor it is in a large house which can, if we wish, be made absolutely dust proof and connected witn tne outer air for ventilation, so that I am not anticipating any trouble whatever from the heating or sparking of motors from dust. This large chamber or house also gives us ample room for working around the motor, removing armature, etc. This is amatter to which I have given the greatest consideration, and I think when it is your pleasure to go over the mill after it is running, you will find that all these points have been thoroughly attended to.
With reference to the electrical scheme for operating the plant, I will shortly send you a drawing giving a general Lay! out of the buildings and the location of each motor, so that you can advise me with reference to the wiring, starting, stopping, ete,
I have been trying thin copper washers in place of the raw hide and they are a success. I wish you would try a few up at Stewartsville in the worst possible places and let me know the result. .
I note particularly what you say with reference to the setting of the motors, etc. and it coincides exactly with what
I am going to do; and another thing, particular attention will
it
be paid in the putting in position and securing the motors so that there should be no trouble from getting out of line. -
We are just working on the fans for the blower houses and I am pleased to set your note as to the strength of the fan shafts.
With reference to the drawings for the briquetting furnace, I have been asked by “tne powers that be. over here to hold up on this matter for the present.
Yours very truly,
i dic
[APRIL 18, 1903]
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——
ALL LETTERS SHOULD BE ADDRESSED: ~
ENGINEERING DEPARTMENT.
TELEGRAMS: STANCOLLI,LONDON.
“ys
Yonder on Mitteltore: Dol fotadion: lomrlect:
G ee Y;, 44 ee i ae Std. Miecl;
C/ ees LOW, WC,
No: 21. April 22, 1903. THOMAS A. EDISON, Esq.
Dear Sir,
We are mailing you under separate cover a complete set of drawings for the Fine Grinding Rolls which have been carefully gone over since my return from the States, and in which you will see that we have incorporated the Suggestions made by you. In this connection I would call your special attention to my letter to you of the 7th inst. with reference to the various Points we - had discussed. ;
We have not yet received final bids on these rolls from the various parties to whom we have sent the drawings, but from what we have received I feel certain that they cm be bought for Scents per lh.
. We also mail you drawings showing the lower set of 5 ft., that is, the spring rolls, and you wil find on these
that we have increased the length of the tension rods which go
{ H H i
through the two bearing housings as Suggested by you, making them |
long: enough to get in six 14" white pine Washers, putting three
on each side or putiing them all on one gide as may be fowmad most advantageous.
You will please note the change also with reference to , the wobbler ,-‘ thé part that is keyed on to the end of the moving” roll being turned down so that we can draw out the bearing bushing without being obliged to take off the wobbler end, as this end will he put on with a good press fit. You will notice the groove also turned in this wobbler end and this is to be used in clamping on a pair of clips when it becomes nece ssary te take off this casting.
We have not yet completed the drawings for the hoppers of the crusher plant embodying your latest suggestions, but have them well under way ahd will forward them to you shortly.
I have no idea as yet how much this work will cost but will let you knew after we send out the dravings,
When in the States I gave you the price at which we had contracted out the Giant Rolls, the 5 ft. rolls and the chilled
plates. The Giant rolls cost 4.08 cents per lb. The 5 ft. Rolls " 4.18 " " mon The chilled plates " 22 " non
I will have camplete statements made for you from time to time giving the exact weights of each machine, etc. and the exact costs of sam.
“With reference to m elastic coupling, I am going to investigate one af which 1 have heard and of which I am told there
& :
A tek ‘
5 ae eee
are over 200,000 HP. in operation varying in size from5 to 500 HP. and which are being used for all sorts of intermittent and steady work, When I have found. out just what this coupling is and
have seen them actually at work, I will make and send you m understandable drawing.
I have had made and an now testing some sample idler bearings - one of which I will shortly send you just so soon as my tests are completed. We think they are first eusas as they embody the best features of our old idler bearings and many new features which make them:much more mechanical and sites more
satisfactory.
Yours very truly,
Wh
—_——
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[APRIL 24, 1903]
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[ATTACHMENT]
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Gtindirl’¢ Conali MMlOWe Goh eyfeo WHiOW = Lemilede % ee ‘uy ALL LETTERS SHOULD DE ADDRESSED: Ailje Lttpde CA oe, Pundel Awl
ENGINEERING DEPARTMENT. fe TELEGRAMS: STANCOLLI,LONDON. : at OPMOI WC, No: 22, May 2, 1903,
THOMAS A. EDISON, Esq.
Dear Sir,
i have your favour of the 18th Feneen note that you are preparing for me'a full inspector's report and other records. I am not surprised at the trouble you have had with the shafts of the blowers; if I remember rightly, the bearings are about 10'6" apart and the speed of the blowers has been almost doubled from what it was originally intended to be, I have been working for some time on the drawings for our blowers and shall shortly. send them to you and you will find that the bearings are about. 7'10" apart, and the shafts 3 15/16, whilst an ample baffle arrangement is provided with an adequate fall for the material on
to the first plate.
With reference to the gunny chambers, would say that in
the Dunderland plant we shall not have any. small gunny chambers.
in size according to the motor from 1500 to 3000 cvbie feet, with plenty of room to get around and in every case arranged for free
access of air from the outside. I have given this matter very
5 In every case where we have a motor, I have a Large room varying
particular attention and as I am working out the designs under somewhat more advantageous conditions than with the Cement Mill I am ele to arrange this work in a better manner.
With reference to the gears, 1 recollect that the face of the pinions on all motors driving conveyors on the Cement Plant is Ahn; with the Dunderland, all motors up to 30 HP. will have pinions 6" face, and those of 60 HP. 12" face which I consider very anple.
I do not anticipate any great vibration where we have to place motors in the roofs of the buildings as the whole of the structural work is at least 33 1/3 per cent heavier than at Stewartsville and besides being strengthened and specially braced where motors are carried; besides this, there will not be a single over-hanging gear in the whole of the ‘plant.
With reference to the flexible couplings, I am sure we
shall have to use one in connection with the 5 ft, crushing rolls |:
and the Fine Grinding Rolls, and I shall look around and see the
many that are in use here and on the Continent and pick out the
i
'
one I consider best, as our Directors do not think it advisable toa
use anything but standard well tried machines where we can do so.
I note your sketch of the flexible coupling and wuld
i
say that I have seen one very similar at work here, but with this |
exception, that instead of the two rollers working against the
outside of the tightened belt, they work between two belts, and
this prevents them from getting away from their contact it there
_-to do this and I will look into it; but as I nave so much more ‘
should be a sudden stoppage of machinery, which you will see is decidedly an improvement.
I shall shortly send you the drawings of the whole of the hoppers, ete. in the crushing plant, blowers, ete.
With reference to men, would say that I have as many at work as can be profitably employed and have no fear of "getting into a hole" eithér méchanically or otherwise. :
_ I note that you are changing your exhauster from tte
top of the dryer to the ground. It may possibly be well for me
room arid a go much ‘stronger pbuilding, it may not’ be necessary.
a _.i had already made a note when with you in Florida. as to the running to- one side of the lower belts and have arranged to put. the idler: pulleys every 50 feet. so, i
Ps Shaye some of the bearings for the. conveyor ddlers |
now at work testing them, and so far as we can see,they are : | simply perfert. I shall shortly pack up one of these and send it to you for your criticism. °°
an It may be interesting to you to know that we are about acquiring the lease of a piece of land and several oulldings. where we intend to establish a laboratory with crushing, screening, blowing and separating machinery, so that practical tests can he made of any ores, etc. coming in.
| | Trusting you are well, I am, | |
Yours most sincerely,
ie,
ety cots 4
al
CL. “ Sila pe mdtivicttow’ Ovrt botalione. BCralecle
Figs Geer a elif oes lotlac: I Lanilel. Ascot:
ieee OU WCC, ‘May 5, 1903.
ALL LETTERS SHOULD BE ADDRESSED: -
ENGINEERING DEPARTMENT.
TELEGRAMS: STANCOLLI,LONDON.
THOMAS A. EDISON, Esq.
Dear Sir,
I have your .two favours of the 23rd ult. - one No: 18 and one without a number - and also your favour of the 24th ult. No: 19, contents of which I have carefully noted.
It seems to me as if we had anticipated you somewhat and I am very glad to know from your No: 19 that the increasing are increases the grip on the head pulleys in much greater ratio than length in the space of the free belt. We made up our minds as to this some time ago and I mailed you a little pencil sketch showing my ideas. Whilst working out the structural details we have been working in these belts ond started to use not less than 25! of free belt on our short 24" conveyor belts - increasing this length with the ‘increasing length of belt 80 that we have as much as 50' in some of our belts. I enclose you a little tracing, copied from the one mailed to you before, in which you will see that we have arranged our first pulley carrying the lower belt next to the head pulley to be 16" in
diameter in all cases and to be got up in such a position as to
a
T.A.B.2
give the greatest amount of contact between belt and pulley.
For these 18" pulleys we are using 1 15/16 shafts and self-oiling bearings. I can however make these pulleys 20" if you think it preferable,
In my last letter I wrote you what we were doing as. to the face of our gearing driving the conveyors, and from this you will see that we have also taken care to have a good width of teeth in every case, .
I have received all your letters from one up to this which I am now replying to, both numbered and unnumbered, as per
your list, and I see from my letter book that I have replied to
all of these as well ag writing you on:numerous‘other occasions.
I have been looking at some conveyor work over here more par tiewtar ly with reference to the unloading and handling of our coal, and I think if you will send to the "Steel Cable Engineering Co., 92, States Street, Boston" for one of their catalogues, you will fing illustrated on page 15 a very good arrangement for a scraper conveyor wherein steel ropes and dust proof wheels are used. I call your attention to this, not that we are contemplating using anything of this kind but merely as a matter of interest.
Yours very truly,
WS Farrel
[MAY 11, 1903]
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Letter No. 19, May 12, 1903, William Simpkin, %aq., London, England, Dear Sir: From the prints of the five rolls I have Just gone over,
I find some of the suggestions T nave made in my letters have not
a
been followed out, and T fear vou may not have reneived aome of them, 89 IT have had copies made of sach letter, which now send you undar registered mail, and I beg to ask thatyou will hereafter acknowladge receipt of each letter T may write YOU,
Please note that the suggestions made are the results of the aotual exper tence we have had and are having at the Cement Wka., and I fully believe if they are oarefully considered will save your company from the loss of considerable time and money when. vou ’ start in operation. on
Yours truly
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May 18, 1993, Dundarland Tron Ore fo,, Fitglan Houne, Arundel St., London, England. Gentlemen:
T have reoalved the drawings for the five foot spring rolls and aporove of the sane if the alterations suggested are nade as per following memorandum.
Memorandum. B.230, The throw of thin roll will be tremendous on Recount of ites weight; the girder 1s entirely inadequate AaB v have statad in two of my vrevyious Letters. IT am very ‘sorry that vou could'nt nave seen our 36 Roll in operation, you would realliae what I mean by entirely inadequate, We nave now put all our supporting neans ‘in solid concrete, Thin of sourse wALL. do avay with the alanttotty of the beams. which tends to save the pound of the housing. . It wilh now be very severe and wea. intend to put about one inch of ruber An for the bearings to. strike agalnat, protesting the. rubher from ot ‘eB far as posalble, I advise that ‘you change your girder +0 a box | girder. Y | cee
B-127, Be@ll. Our filter oil ‘oup with the gauze wire filter ta vary successful but the ponounsions broke the oup off and also the: gauze oup, eing only soldered at. the ton broke off by. momen tur on Atopping aria wehad to take oups aff of banring of rolilg and sonnet Py a
a | & a E:
yy
#2D, T. O:M0, rubber tube, This 196 very undesirable and defeats the objent of
the oup, which waa to forever tnsure the hearing againat erit getting in, as the men discennaet the tuhe and leave it onan for grit to
fall down from floor ahove and get into the bearing, T have a new cup in which the gauze eup is supported at top and bottem and the
oup itself is supported by an iron frame holted to hearings, If
you put the oll env on ton of the tube on B-127, it will vreak off within an hour withont i 1s braced at the top. What is wanted is the gauze filter ow inside and a part of the bearing. Tthe gauze
op being susvorted at tov where 14 19 soldered and at the notton,
Gould you not vut filter in eup on B-1e7 and still have it eonventent?.
B-232, There should be a flexible inserted between motor and rol drive on account of the inevitable throw of the housing and rolig on even the strongest box girder, the shatta having no wonhler will not work, it will heat up badly. To atop thia you will have to Be the wobbler on both shafts. Tr the throw at the rollge and driva gear supports could he made the same, posAlhbly the senond wobbler . would not be needed, duh T think this is impossible.
B-1?73, Think shear hush should have a minunwa diameter for the reason given on report of fine erinding rol. We use for shearing pin on our 36 Rolls nine sixteenths, so vou better start with thins alze, How about room hetwaen gear caning and shear dink +0 get your shear pins out, Same trouble with shear pin clamp as revorted on fine grinding roll. . Grease oup for oiling gear will jar off if
not fastened well,
B-169, 9. KX.
B-196, 9. XK,
yy
#3 D.I.0.90, Be1l95 O.X. B-197, O, K. axoapt roll extension shalt, ought to be ohanzad to
wobbler connection. for reasons mentioned,
B233, B-234,. Wilk the and ehuck hold on the roll shaft without ‘ i backing off, regarding this form of wobbler if i Avonort anea
right I suppose it will do the business,
Bel?72,. 9. K. Jotntsa should ba packed with paper or equivalent,
C-115, 0. K.
. 0-133, Use pine instead of maple... Haye spoken of thia in three
differnet letters, which makes me think you mist have missed some of the letters. See remarka ahout block of rubner to take shook
in addition, Otherwise 0, XK, C.120, 9K Cs121, 0. x, C-118, 0, K, 0-132, 0. x,
G-115. The plug hole useleas set by a mark. See report on fine.
grinder. Start the shear pin nine-sixteentha. Otherwise Oo. K,
0-134. 0. %,
0-112, 9, K, : se What is ohJeat of naving ‘the key seat in bottom of all the bearings 3 inchea by 6/5.
‘yy
Basil 9, KX. exoapt regarding satety of the forced coupling for
wobbler.:
B-227,° 0. Ka
‘BH195 0. ¥,
Same remarks ahout locking of stud holts as given in report
on fine srinding roll,
Yours truly,
. Vices Oh. Fdeter
handlare Constiuolion Ceroralion Borited
Hernia Vo MMALOWE OOM+fOUM ON 2 Cee : Go a of G7,
ALL LETTERS SHOULD BE ADOKESSED: Alger Le ee Paenelel bec
ENGINEERING DEPARTMENT. i fe . 4 i 7 TELEGRAMS: STANCOLLI,LONDON, cet OVO WC, No: 24. ' May 19, 1903,
THOMAS A. EDISON, Esq.
Dear Sir,
Acknowledging your letter No: 19 of Hay llth (I alse received a No: 19 of April 24th) woule say that I am going care- fully over your previous letters, all ot which I have received as per my letter No: 25 of May Sth, as I am under the impression that we have carried oury alll the suggestions Which you huve made which are pertinent to our work.
The fact is that we are not doing a single thing with- out giving it the fullest consideration from every point of view and WEEE advantage in every way of all the suggestions which
you fron ‘time to time have go kindly given us.
Alsc we are watching carefully the manufacture ef every piece of machinery und shall continue to do 80, as we wish to have this plant erected in a thoroughly mechanical manner so as
ae to obviate as much as possible any trouble except what one signe
has with the starting up of a new. concern,
Ioaa going over tc Norway in the course of « few days so as to see what can be done as to preparing for our excavations and foundations, and will write you fully on my return.
Yours very truly,
—_—=
ag Ch se Ky 1c IOs . Lesa AO Lon MbitteltOv Dotfiotalion: temrlecl: F ZALA HO » ARUL Ee v4 T, Se US TTB TELEGRAPHIO ADORESS: Le “STANCOLLI, LONDON." st aon WiC.
20th May 1903.
Mr Thomas A. Edison,
Edison Laboratory,
Orange , NEW JERSEY, U.S.A.
Dear Sir,
The Dunderland Iron Ore Company have handed us a letter addressed by you to them, dated the 11th May, on the subject of certain of the Dunderland mill drawings.
We thank you for your valued observations, and have requested Mr Simpkin to reply to your letter on its technical features.
Yours faithfully. STANDARD CONSTRUCTION CORPORATION LTD.,
Secretary.
TA4 Wi J | OF a ae Undberd Vidi. bor firradion: Limited, oe ry, eA Aulpe re e. Vee My eer ad ey, :
ENGINEERING DEPARTMENT. : Se ant OUEOI1LE WC,
ALL LETTERS SHOULD BE ADDRESSED; -
TELEGRAMS: STANCOLLI,LONDON.
No: 25, May 20, 1903,
THOMAS A. EDISON, Esa.
“te UV Dear Sir, A
Your favour of the llth inst. with reference to the Pine Grinding Rolls (which you evidently.uddressed to the Dunderland Iron Ore Co.in error) has been handed to me and carefully noted in every instance...
Final drawings will be sent to you for filing, as requested. In this connection would say that I have decidsa wherever it is possible to use solid forged couplings so that there can be no popsibility of slipping.
Yours very truly,
Hs pL CD dad ee Doi feotalion:. Sirnelack: ALL LETTERS SHOULD BE ADDRESSED: - Lin LDF! as Poundlel Let:
ENGINEERING DEPARTMENT. Vy ; amet OULOOIL. WoC,
TELEGRAMS: STANCOLLI,LONDON. No: 26, May 22, 1903. THOMAS A, EDISON, Esq.
Dear Sir,
Herewith please find print A.172 which is a skeleton drawing of the bin below the Giant crushers as far as the first set of rolls - changed in every Way eccording to our conversation when I was in Florida. The details we will send you later after they are completed,
Yours very truly,
We Base:
Sell Convene. 0 ftoralion Limit: mene co 4 “s : ALL LETTERS SHOULD BE ADDRESSED: ~ Liljalan House BPrundel Groot:
ENGINEERING DEPARTMENT. Le rLOVMEONGZ WC,
TELEGRAMS: STANCOLLI,LONDON.
No: 28. September 4, 1903. THOMAS A. EDISON, Esq. we Dear Sir,
Since my return fron Norway, ard later from Stoctholm vhere I was sent hy the Dunderland Iron Ore Co. to join Mr. Ballantine and Prof. Louis in an investigation of the Grondal furnace, - this is the first ovnortunity I have had to get together and mail you a lot of prints.
Before leaving for Norway I sent you a skeleton drawing of the bin, eve. underneath che giunt rolls in which I embodied all the changes and suggestions which were talked over wailst I was with you in Florida.
I am now sending you the details as Pollows:-
A.172. 176. .
B. 269, 270, 289, 290, 291, 292, 293, 297, 299, 300, 501, 504, 505, 306, 507, 508, 309, 310, 311, 512, 315, 514, 316, 317, 318, 319, 320, .
, C. 155, 316, 137, 148. in all 33 sheets.
Crusher piers, A.160,
Tne bowen onalten wor Uravnnghty anode o Ast
Drawings secubies ete, A.l24, 149, 150, 174, 175, 177.
B. 205, 204, 205, 206, 207, 208, 209,210, 277, 278, 279, 280, 281, 315, 521. .
Sey ined of Blowers - A.176, 179. B.522, 350,
Diasrans of seneral lay out, and also of ull the buildings, head and tail pulleys, ete. - .
A. 125, 126, 151, 152, 153, 134, 138, 157, 140, 141, 155, 180. ;
B. 217, 218, 229, 220, 221, 222, 223, 224, 225, 226, 235, 240.
Also drawing A.193 which is the skip for carrying up ore: B.d42, the skip car,
With reference to this skip, you will note that I have
drawn it out somewhut lighter than Ne had taliced shout ag I have seen some skip cars almost similar in design und they dee. Lined on the sides: and bottom with 1s" nara wood planks which add very considerably to the Life of the ear.
Awaiting your favours, I am,
Yours most truly,
WU lattes eee ao
awe ile write Pratl anbine whe a ipuunims oat Gromoe | ¥ Wwe core combing Matar
Anine.
a ae eee
ENGINEERING DEPARTMENT. re LENT
| : |
| |
‘Ha LO RA a ae Endeadl DondMiucheore Meifeotaliores A :
Higa litPn ee Co. Deomtd: \ seals
ee WG.
Teceorarnic Aooness, “STANCOLLI- London:
OM romk oye
“orn win Lakin We So
dues eyer- Som Wniling frm Aplin om eppukle Url gore fy
Mu mak. Kuncl qu uh peadus
dw £m uv ok Rbeworksqntle
Sept $. 0%
| | | | |
= eke Be,
Cfo... Cs . Ky Sie BaI ene 4 Pott Dov MAO rot fotalion: Sie By gk te S ALL LETTERS SHOULD BE ADDRESSED: Libjalam Meader Gil it ENGINEERING DEPARTMENT.
TELEGRANS: STANCOLLI, LONDON. | em LOMMOI WC,
| Sepl- $.0%, ovr Yast fodubow
Wi" Ahoder fas purk been iw amd Ahoun
ow. 3 thaw you vouy anud sor your Aa citey words , Ayub tor khe Life of ome Ycamnet smdestand, Your oppor uw- Lack A cov fudence wm built, b ¢
our khus werk ko a AMceepshuh Uabit « Simce 9 howe been tune Yhrowe had bur ome Purpose im arias bo c wu your wishes With. peqand G thr Clank and lo Moke ub ow Aancetor, Sunee Khe doug me {uvak Aoid owe Khe Prin wary Ancasinn yr ond dlecececl uw Mar general ovromounuk , wp bo khis amo inh, out o khun Nor bun homaed me where any Aammerple Mf you Ayshum. V Mwelwed and 9 oun olden Ponkrouton Pawn Ao you, paqaeeruws - MU ho tun. ~ on odrsitut Onguedl ac owls
awe oa Leker
tenbady constant pludy Ae Kup “foduscn' prow + 9 howe hupeoumed. 4m shes tub hon wlioducech moduteakiuns | Pugqubed othe. In {ack ok Kner Y have fad be be | Akubborn ¥ wnpheasont - Im a peore 4 Revs cn: vust> Angin bs ket you how 3 have had 4 akomd wh 0.9 amok | | South Moma. tom behalf A ym ¥ yn pyshom. Comrdonee Aeouks Combidence’ ond yu wher § hod ae braqel eluate
Ns
Jt dmko Une, here comer w Letter
cy ee, ie Yen bet Coble Cor litho Line : a 3g . ALL LETTERS SHOULD BE ADDRESSED: - iljalan Mouse: BPundel Sst?
ENGINEERING DEPARTMENT.
TELEGRAMS: STANCOLLI,LONDON.
te aLOWMOIM, WC,
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i. Geo , . Go a3 oe os ended! Dona ition Dolpotaliow led CG Li ALL LETTERS SHOULD BE ADDRESSED: - Ailjalan ae Bundt Lvl
ENGINEERING DEPARTMENT. 7 Se TELEGRAMS:. STANCOLLI,LONDON. LSA We.
Aides bhi wwe durcmsred a amon fenkunes O Maem urn {wor in CPsvider , gen, wie 4amces dee which 9 umtuun el
dy Lei bo Wor puiuom hou. Up 12.0%. Hoowevr 9 wilt Oo mee hove omother Ack 6) prams nade y morted be you. Said at pmad yw Whe ISpuen Anowuniys Or hey Ltn Olt
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Keep wut- kus ol Leask unt 9 Could 4atk matters oer Wi, yr jut Ahe C2 cowk Khe ana M49 ond 3 had mo Chaves tut obey wstucckims « OUr Mats Aime 9 ult sak. ray nok amu Arrccembut Aviguutte, une facductd , beret Gens A which Pom tun pm bo Cit hue they have dtm Mad + De Vndick vs fourvralte . 3d wu phatly ana yeas a Hate denen bu + whe ay su Pag Pow peeport, nowy, Mm ammd his pauviour pepe om “Magnilie Supanakim « mw whid, ym write, “Bumpitin Read bus dew Au aw Uw oreo eh eee onre: whol J amen when 1 pay 9 how had & Vom d ifs ‘hh eae Your Barton - br We lvl “howe re at ae Spud te kmdon om yoy a amd Aue
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TELEORAMNS; STANCOLLI,LONDON. eT iis + Specicatims , ohn g, um tnd on co uve dow , Unen opera, » Maw w pilown emo. utide uo te costion fine showed ame we Autd Ae w Me Aimy. dann anarr Vw som - po § po ot Mae dads wine kee ugh and 3 arked Ame Moand
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Wie een dume wnttrouk comrarclu ably honk werig m ny part uu S dod at wipedk by trove As Kole Ap - 9 Munk howewer y ice will = ees ame hak uma be om euia Askew Un
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Or’ Ue ide OA we BA omy duty. 9 an wud pecton a, ankor day Oy war frends "Ho Ruberts + 6° de ot wow anove= He Omnencan ) Mnghusts ¥ Terwegion 4p afrers - 9 ow woth on WS Conny the omnunage . Oroneca, + Aha Se crue Ahan embed: U Oh the tonrptelin odie init From Yeun. Ciwnendatim. Vow uote 9 wank 46 aad os Un our yee phew a doth ame ervpdence bn come + biy ¥ qu U. vk ik dyown Om tn nuk Yom aying a rom Wow MS (upurrede Um Ww Unrs wovig- 9 asrune you Unol- wn mss drm ce Cand, nok Yon tnt ere pum wher Mee pur wae dDLowl- aw Operon - Down wang, podqunod- hes ion an ea erie BA, Sia bea Tuadlny, - On my honk Wik MS Shuuontavule 1S qe wn te MON uv WW. fone al- your pag aparum mask moter A | xn “bugs” + hang’ Deke oo lark patted QO certame qetleman | Who fuumed te howe Grange A Khia dnote had Ura or fear drokthmin tw Mae Tet [eady ke @Uronl- work whubek bho who | Arad bem m ohh + with, Porting wire alee abr. diab | hole uri gle be hoy tr Yan guuttewnan kee 9 trad desemrel — (b)
P Veipteial Cooma iti tow Lot pirralion: Limiled:
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TELEGRAMS: STANCOLLI,LONDON.
C ey LOI, W.C,
o& Many Hhumnas wit ym + About Phurtty Ancol Aume
Cromnas em ma att wt had dated odnuk “for yran Wppanral . te Replied unt a Aud wre + witty a cyrucat laugh, | Lavterg, Ovurwnd Ais puro, 4 op pauvat = Oh, wad wll ms > Ae Anowwinga pees tuk Khun ab = urticky Q orunre was PponGembonty mace + fp learont- me. * ct es Ahe ee a) en ee ee undid. luhutl- 9 divs wank OF Cruiticire Me qunitemn en J cmmal- One Mane Kindly ww future be AON taf omy Work Yount. ¥ tee th be a matin fetwen w+ Aaah cme be Kody con dh out thu Ratile etoile. hob matt te dha | your Rut, t& Wt Raed, Y dunit. Amo. He want : Fork haste (6 Porrewein- Furners who Hu Stet dretdut wor hating, a muta, y sou Sun Pa ale, I een + Wu Wbtr ovr Ond ott pur awe cov tamed, m Aum diny ae wrth Ne Brew wn oboled Crvfrolenee Mm cme ¥ ww werk. J chon Levit unt, Avakmuale US yan aeply OF iss Auwrertrol- Lng CUnmnun cotim - Pwd aro ty
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ae : : Vo ; eee sags inital Conathuclion *beyporation Limited, ALL LETTESS SHOULD BE ADDRESSED: - ee SI Yout: 2
ENGINEERING DEPARTMENT. LE amt OV eae We,
TELEGRAMS; STANCOLLI,LONDON.
Cement Plow. 9 hear ne Mattern wm mum Me Marler +9 cm grvalutoure Ym, « wy does'ple hie ane stant’ 2 oh parts OF Schomy v J om cru Koll, Marohng, erkevynodes mm Otand Orn aa Cua rosy Comurt- Plants te. te
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CG te ann Ss 4 CH Gli lundiuction Coote limecLantlid a. my P Libya Lito oS aN Sandel Local
ENGINEERING DEPARTMENT. Vy oe OPLLOWA WC, Teteorapnic Avoress, “STANCOLLI-LONDON? Sg ak. S, 0% +, 30 p.m,
Farms A. Sdn bag
Dean Sur QO great many. HL wun -perfpte
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ENGINEERING DEPARTMENT. ; fe ary p Eee te oe oe a Se LONMMOILZAW. CO. IELEORAPHIC ADDRESS, j
Sehr. @.0% WS pw. Cromor te. Podium nq -
Bean Ww. Sodium,
Yon york iw pep fH. a onthe aakwnd ome % ottmd o emeehn 9 SL aa, wrevien
Commit im da, 22M wal. te cdeuay dhe Brequuting herone: Brawn omy Ka. cows, Avkun with [Uperte Grn com gacye ae wel, OL he Austin « S Khwk eur vs
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| _—- ‘
-¢ Witree sen Doni wahton Dotforalion Linnell: a Go a yi s te th AUT UST TERS SHOULD BE/ADORES SED; = ilps LP ude, Vouerrdlels Veels
ENGINEERING DEPARTMENT. 5 , TELEGRAMS: STANCOLLI,LONDON. No: 29. eee Wc,
September 8, 1903. THOMAS A. EDISON, Esq.
Dear Sir,
When Mr. Dick was here a short time ago, and soon after: the matter of briquetting had been discussed by our people, he told me that he was writing you with reference to the same and asked me to send you as soon as possible full parti- | culars of the Grondal process which it seems our people have decided to adovt.
I went over to Sweden several days after Prof. Leuis and Mr. Ballantine had arrived there and had an onportunity to investigate carefully one of their furnaces which was at work, and another which was under construction. .
The furnaces are simple tunnel furnaces of the ordinary type and differ very little from the furnace which you were building at the Lavoratory in general design excepting that the crow of the furnace is brought down within a very short distance of the briquettes on the car passing through, and that producer gas is used for fuel instead of powdered
coal.
ee
TASER,
i enclose you exhibits A.B.4. and Pp. which will put you abreast of tne position of affairs at present.
ee is the report. of Prof. Louis and if vou will read this carefully you will see tnat he has none entirely out of his way making suggestions, ete., as he has I believe in all other reports of which copies have bsen sent to you but more parti- cularly in his report on the magnetic separation which you will very well remember.
Exhibit "B. is Mr. Ballantine's report which is some- what more to the point.
Exhibit "0. is the Minutes of the meeting of the Works Comnittee which was held to consider these two reports. I may say at this point that when I arrived at the meeting it was. very evident to me that the whole matter had been discussed with Prof. Louis in the north before the members of the Committee came up to London, and that their minds were vretty well made up as to what they would recommend. This being the case, I had very little ‘to say as I intendea to look somewhat further into matters before agreeing with their recommendations, and this resulted in Uxhibit 'D a which is my ‘report as you will notice under date of August 31st ig much later then the others.
Since my report has been sent to the Committee I have
had no indication from them ag to what they intend to do in the |
matter, but I am Pretty well satisfied that they will eventually
carry Out my suggestions ag to leaving out this extra pet of :
‘rolls which I do not consider at all necessary.
I am sending you one briguett which was made amongst many by the improvised press and afterwards passed through the Grondal furnace, and i think you will agree with me that it isa very fair sanple of what a briquett should be. This contains about 702 hematite and 30% magnetite and no added fines - ef this Iam perfectly sure.
The whole of the briquettes made Were just as good as this one but those fads with the Grondal Press were not in any Way equal to the one I send you.
I have gone carefully into thig business and if we are to adopt the Grondal furnace I am satisfied we must also adopt anothsr press, other then that used by the Grondal people - which is avery crude affair at the best - and it is for this reason that I have recemmended to the Board the adoption of the press made by the Mould Co. of Pittsburg -~ Exhibit E.
_ this press will 1 think make the cylindrical briquett or it Will make the size and shape as recommended by the Works Committee, and whilst I am perfectly satisfied that we can handle these briquettes automatically if made of a cylindrical shape, I agree with the recommendations of the Committee that we €0 slowly on this point and put in presses to male the 6" x 8" x 6" pyr iquett which will have to be removed by hand to the cars,
I know the Moule machine very well and have seen it in
use in @ great many Places, and to my mind it is so much the
eesti Re ote Se ae sete eeSe, des
a
WAT.
superior of any other briquetting machine which we can purchase that I had no hesitancy in recommending it to the Board.
there are quite a number of briquetting machines made in this country and in Germany which I have investigated but I do not think that any of them can come up to the one recommended in any way.
Whilst waiting for the decision of the Company &S to whether or no they will adopt the recommendations of the works Committee, I am making a general lay out which I think will be best and after I have got it into proper shape I will send you a print.
After you have gone ever these several enclosures I Wish you would write me what you think about it anyway. As this is not your briquetting scheme, I was in hopes that J might have been left out of it entirely and that it would have been turned over to the Grondal Engineer, but when I found the way things were going, as usual stuck my finger in the pie’ and this is the result. ,
I should say that quite a larse nunber of briquettes were made of the Dinderland ore - both by the Grondal press and by the press improvised by Mr. Bellantine - and there is no comparison between the two ay the briquettes made with the improvised press are go much superior to the others. Quite a Quantity of these briquettes were sent to the Consett Iron Works
and the report of the Works Manager and the Chemist is very
wl
eratifying, in so much so that all the worries which our people have had with respect to getting out a satisfactory briquetts seem now to be set at rest,
Yours very truly,
WM Paden
—
[ENCLOSURE] ’
N
Report on thie Grendal System of Briquetting. fee EE PON
The DIRECTORS,
Dunderland Iren Ore Go,
Gentlemen,
In accordance with your instcuetdiens, I acain or on
ecded to Herrang, in compuny
th Mr. Bullantine, to conducl a Yuriher series of experiaants upen the Grondul system of bri- augtiing, which process I nave aéseribua in my. renort t¢ yo dwted April 2ord last.
The Grondal Process proper Ly speacine consists Sesentially in makin bricugiles cr iron cre without any binder @xog pt Water, aud Pairine ths briquettes thus made in the long tunmsl-lie furnaee
» dravines of which Becambenied a
already referred to. The material exnerimented on consisted
of Dimderland Sruculur iron ore and magnetite, a
dn varicus rar
propervicens rangine frem bout 10% ef the former and 90% cru
dutoer, vo 90% of ithe former and 10% of the latter. All the
mixtures cave bractically identical results, and it woulda seem | that soveuler org is just as easy to briquette as MePNStELe, °
alinowen it may bossibly require a Athy higher tempsrature,
' | Exveriments. wera tricd with Uriquettes made in wie Ways, namely | in the drop press previously dexcribsa, and in a press impr o- vised by means of 4 bowartul serew jack, which made a priguette / Soin. in diameter, nearly 4 in. dong, and weighing shout 6 dhs./ vs , The vressure exerted in making these briquettes wag probably - about 2 tons per square inch, and the briquettes wade in this Was were rather hetter then those lade in the drop-press, In both cases, however, a briquette was produced which would perfectly well stand nandling (before going into the furnace ) iit which was too tender to admit of automatically charging
upon the cars, -]-
[ENCLOSURE]
Ahont ove ton ct Dinderland briquettes was made
In various ways, and ell ef theag were quive satis-
fuctory, the resultine briquettes heins suronr and hard, and shewing no tendency to ferm fines. A. briquette taken from tie furnace at a red heal could also be thrown into a bucket of
water without disintegratins. The briqueites produced (about
one ton) have been forwarded io tne Gonseut Iron Ore Company ,Lud. The furnace worked well and economically; when warkins on Herrang magnetite, it turned out in regular work a car cf briquettes, weigzhine ohout 15 ewt. every half hour, with a
coal consimption in the ras producer equel to 3.75% of the weight of briquettes burnt. Allowing at the much hisher rate of l ewt. of coal per ton of priqueties, and taking the coal
to cost 10s. per ton at Dunderland, the cost for fuel wild amount to 6d. per ton of br ique ties, The charnel hereath the furnace was alyavs fairly cool, the furnace lest hut little
heat hy radiation, and the temperature of the escaping pases,
as elso of the issuinzs briquettes, was about 150° Cc. There
is therefore but Little heat lest, the chief consumption beings i probably thet required to evaporate the water in the raw briquettes (amounting to about 7.5% of the weirht of the ore).
The temperatures atlained were measured by means of Seger cones,
Seer aig et
which showed thut a heat of 1400° C. was readily obtainable, The furnace is not expensive to build and should cost but Little Tor repairs; it thus evidently answers all requirements, It must be remembered that the furnace at Herrang is intended for calcining, so as to remove sulphur, and not merely for burning briquettes, and hence works relatively slowly. ng found that Dunderland briquettes can, however, be burned perfectly when drawing cars at the mate of one every quarter of an hour, and have no doubt thet equally sood results could he obtained by drawing at the rate of one every ten minutes, if Dellwik water-
-2-
wb en
—_—-
[ENCLOSURE]
cA Or Producer-ras, rich ‘in hvdroeran (such sn meade e.c. in the Taylor or any other producer worked hy a steam jet), were employed instead of ordinary producer gas. Such gas gives a hirher local temperature and would therefore be preferable for the manufacture of briquettes. A car of drop press briquettes (6" x 6" x 5") of DunderLand ore will carry iwo Layers each
of 12 rove of 7 briquettes, and as each briquette weirhs about 5.5 kilos, each car carries close upon ore ton of briguetres, For a larre out put Multiple tunnel furneces would he best, a 6 tunnel rurnace forming probably a convenient unit. Such e
furnace would be ahout 43 ft. wide and 165 tt. long. Assuming
gach tunne) veo burn a car earryi: one ton ef briquettes every
15 minutes, this mit weuld burn about 500 tons ner dey, go that 6 such units (6 in action and one in reserve) shevld suffice for an output 2500 tons of tbriavettes daily, The width of car new in use nas been adepted so as to enable the workmen to
place we priquevtes upon the car, working from one side only. If presse, were arrangsd along beth sides of the car track,
the cars gould he made wider, say about S ft. thus micings a i
better furnace, and allewine a 4-tunnel to he gubstitutea for
| the above 6-timnel unit. Such a unit with cars taking 12 rows | of 12 briquettes gach arranged diagonally as at present and { with two tiers on each cur, would turn out rather over 25 tons i
per hour, As eagh press makes 10 briquettes per minute, 8 Presses will be required for each unit, these being con~ VYeniently arranged in two groups, each supplying a pair of tumels, and being arranzed by twos on either side of the aar track; the pair remote from the furnace vo uld make priqueties for the lower tier, and the pair nearer the furnace those een the upper tier. Each unit would then require & men ner shift at the presses, 2 at the charging end and 2 at the delivery end
~3~
eerees re We, teem othe ee ANS ee SY aa tl ' 1
[ENCLOSURE]
of the furnace, Allowing one mw -t tre pas producer and 1
msn st the mixer, assuming that three shifts are worked and that wages averpre 3 kr. nar day, wares vould anount to ahout bda.
per tor of briquettes, Each press is stated ta reovuire 3 HP.
so that allowing fer the haulage of the cars a $0 HP. motor
verld bo reantred tor each unit, corresnoidins to a coal con- sumption of say 30 ewt. of coal daily, or but little over da. ver ton of hbriguettes, Tee tetal aost of fuel ara waces weuld thee bea shant Od. ner ton, to which moat he addad the charecs for wear and tear, repairs and maracement; ro data are
So
aovadlable for estimatin- thease, but it seens safe to assume thet
the total cont of briqnetting hy this mathed shenl@ not exeesd 1s. per ton.
By the employment sowever cf a powerful briouettine machine working by pressure and net hy a blow, 1.4. a press actuated by mechanical leverase, or by hydraulic sover, it s3eas possible that a briquette may he produced finn esnouch to ‘ hear transfer to the cars by mechanical means, and thus to ‘
dispense largely with hand labour at the presses. I an inclined
to think that a evlindrical vriguette, 3 in sin diameter, and
enouch to bear such treatment, by & pressure of 4 or 5 tons
| t Ste4 in. Long, could be made with finely round ore, stronr | Per square inch, or say a total pressure of 55 tons, but this
is a point that will have to be determined by actual experiment with @ suitable press. Our experiments at Herrang show that a / car filled with such briquettes can be burned as thoroughly and as rapidly as a car charged by hand with the present form of square briquette, and that the fact of these cylindrical briquettes touching each other makes no difference to their thorough burning. All questions concerning the burning of the briquettes may now be looked upon as satisfactorily settled.
-4-
Sen S ee ae ‘ panne eres “4: one
[ENCLOSURE]
That of the best form of press, and in connection therewith, of the besd shape of briquette, and of the best way of transferring the same from the press te the car, still remains te be decided by experiment with varians types cf presses, -
My conclusion is that the Grondal method of burning briquettes of Dimderlland ore has been proved te he cuite successful, srovided that the following peints are attended to, thess Deing stated in the order ef their importance:
1. Sufficiently hich temperature. Tia temperature in the combustion chamber must never fall below 1300° G. ana is hest kent netween 1350° and 1400" Cc. This can ceadily be secured by naans of sroducer Gas made with the injecticn of u suPlaedent quantity of steam, and with a oroverly proportioned furnace.
2. Pineness of the ore. The mere finely ground the ore, the better are the resulting briquettes, I ain inclined to advise that all the magnetite siowld be cround wet, and wet separated, us summested in my previous report, and that tne specular ore should be run through a pair of fine @vinding rolle on its way to the sprinkler und mixer, which will feed tre ores moistened uniformly with 7 to 8% of water, and thoroughly
mixed, to the presses,
aaa en, ne a
3}. Sufficiently high pressure. As already indicated
whatever shape of briquette and type of press may he ultimately adopted, the briquettes should be made under & pressure of never ie iess than two tons upon the square inch; «& machine working by steady pressure seems to give better results than a drop press, although quite satisfactory briquettes have been obtained by the use of the Latter. I am, Gentlemen, Yours obediently, (Signed) HENRY LOUIS.
a
t —-
‘
|
-
i
t
{
[ENCLOSURE]
Copy. i
Aurust 4, 190%,
To The CHAIRMAN and DIRECTORS ,
Dunderland Iron Ore Co., Fitzalan House,
Arundel Street, W.C.
Gentlemen, Report on the Grondal System of Briquetting.
I arrived at Herrang with Prof. Louis on the afternocn of July 7th, and found the Grondal furnace in fwl working order rumning nirchi and day. Owing to some difficulty with their fine grinding machinery they ceuld not set enouch "fines" to Keap the fiurnuce running to its fill capacity, and they were thererere only passing half the numpsr of briquettes throwsh the’ furnace ver hour than I understand they have sen in the Aeabit of doine.
As a plan of the furnace has already been sent to you, it is needless for me te go inte details of construction, dimensions, eté. Tne press, as already described vy Prot, Louis in his report, 28 a "drop press", waking aleven briquettes per minute, each briguett welgshing a fraction less than 10 Ibs - the output being practically 100 lbs. ct briquettes per minute, or 2.6 tons per hour, The briquettes are removed by hand from
the presa, and placed on edge on a car, 84 briquettes making one
ern oe Raa nnn A
layer; the briquettes are Placed two layers deep, 168 briquettes i
in ail, or a total of 1680 lbs. per car, Usually # car is Placed in the furnace every half hew, and at the sane tine, one is taken out, although vhon we arrived they were only putting in one car every hour for the reasons already stated. Whether a man weuld be able to stand at @ press hour after hour and remove the briquettes us they are made for a full shift, is something of which I an very doubtful. It is more than Lixely that three men weuld bs required for every two machines, so that using the Grondal press it would cost at least three pence per ‘ton to Place the briquettes on the car. The tops of the present cars
-1- Xe.
rem oor
SE een LE
mer
[ENCLOSURE]
are covered with common red brick, und ts prevent the burning of the sane a layer of concentrate iy spread over the brieks @acn time the cur is leaded up, which seoms to me a very extrava- gant proceesding. Mr. Grondal however is arranging to put on
fire brick covers which will overcome this difficulty vhich is
commen to ali tunnel furnaces used for this and other purposes,
The hottom of the cars in Passing through the turnace remain practicaliy cool so that there is no fear of their burning out.
In my opinion, the economy of tne furnace is Firsy
tanperature of the escaping gases beias 150 co:
crature of the Lrdgqueattes is abeut the sane. This
hich rate of efficienes heworar Couid only be kept up by placing 1@ furnace every hour, es I noticed TPat When we forced the furnace and withdrew the car every quarter of an hour, vhe briquettes came out red hot. This however could he ereatiy reduced by leagthenins the furnace aS proposed by Mr.Grondal,
The producer is charged sisht times in twenty four hours, gach
ins 150 Kilos, or 2900 lhe, par twenty four heurs,
Unfortunately Mr. Grondal had mixad vp our hematite and magnetite concentrate together and had ground up about 30% ef it to "Pines" pofore our arrival at Herrang, As I shivred
equal emounts ef both concentrates (ag instructea() this of
Se a a a ES
course made a very high magnetite mixture, which on assaying
;
proved to he 60% magnetite ana 40% hemutite. This I thinte was
also due to the fact that the ore to make the "fines" wag
crushed in & ball mill and probably a big lot of hematite washed We made several briquettes from this mixture, which are marked No: 1 and passed them throvgh the furnace, They
were four heurs in the heat and looked first rate when they
Briquettes marked Ne: 2 are from a mixture 42%,
‘ the ten a car in 2 away. came out, Magnetite and 58% hematite.
[ENCLOSURE]
Brianettes marked No: 3 are 45 parts magnetite end 55 parts hematite. These were in the heat tere heurs whieh is
the usual tine allowed for tt
3
Grondal briquettes, A quantity of the No: 3 mixture was talcon and made into briquettes three
inches i. dtisseter and ahout 4 inches long by means of & “scraw
Jack", givins « pressure ct abeut two tons per sausre inch, These briquettes however vere much toc weuk te stand automatic handling, cwing to the want of pressure, but vere strong eneugh i
uo stund being piled one er tep of the other tepsy turyy
and as closelyas they would lie on the car. Tasty were casss throuch the furnace and were in the heat the save Lleneth of tine 23 Nes: 2 and 3 Grondal triguettes, and, as you will s2e, are
curtainly a geed deal hetter,
Briquett No: 4 is fron a mixture of 30 parts magnetite and 70 narts hematite, and No: 5 is a mixture of 10 varts nignetite and 90 varts hematite.
No: 5 I consider a most Severe test as all the fine
aust had been washad out of tee ore and this, combined with the f hich percentare cof hematite, makes a mixture to brigquett which, ;
&ccording to former theories, would hea impossible, | A quantity of No: 3 mixture was made inte briquettes |
and passed through the heat in one hour which equuls putting | & car jin the furnace every quarter hour. These briquettes are { marked No: 33, .
/
From the sample briquettes it will be seen that the hich pressed ones are much better thun those made by the drop press,
That added "fines" are not needed as demonstrated by No: 5 as the concentrate from which these vriguettes were made i had not half the amount of "fines" that our regular concentrate |
contains.
[ENCLOSURE]
That the length of time in the heat makes no difference providing the temperature of the briquett has reached not less than 1350° centigrade, as proved bv the briquettes No:$%,
That hematite makes just as good a briquett as magnetite, providing tre temperature in the furnace is wll richt, as preved by hriquett No: 8,
That bricuettes can be piled ore on ten oP enother on the car previcus to beings placed in the furnace, providing they are wice vith a sufficient pressure to withstand the weirht, as proved by briquett No: 3.
These experiments hayn cnly proved vwirt I have
held, - that to meke a suecess ful triguett, hiss pressure is ef the firg~ dmoortancer thut "fines", other than these produced in the rasular srinding ef the ore, are not neeessarys; and thet unléss some eain can he made in @liminzticn of the phosoher ug
by finer erin@ine, it would only he spendine money uselessly te adost it, and that, if adopted, wet esrinding weuld be entirely
out of the question. .
The Grondal furnace is very simple in desisn, cheap to
build and not liable to cet out of order, and does its work,
There is very little difference hetween the Grondal and other
tunnel furnaces with Wadden Io on acquainted, but it is probably
the first time that such a desien has heen adopted fcr the (
purpose ef meking briquettes, / If we were to adopt these furnuces I would suggest /,
two slight improvements ~ one being that expansicn pockets
be left in the fire brick lining to take cure of the expansion; and the other, that the sub-structure as seen on the plan can be entirely done away with, Providings the forced draft be
introduced which would be much more effective and place the
furnace under much better control, making it entirely independent
of atmospheris conditions, This matter I have talked over
-4e
a
[ENCLOSURE]
with the Engineer who has done all the designing for Mr. Grondal
and he is entirely in accord with these sugvestions. The advisability of building the. furnaces in units
of four cr six was talked over, bot this is Something that
cannot te decided immediately as it depends & great deal on the
ground available. and I think will have to he left to Mr .Simpkin
to settle. This much however I would say - that too large a
vnit should not te adopted as it would mean too many furnaces
| i 1 | Hl
idle should an accident han-ar to one ef them. I an, Gentlemen, Yours obediently,
(Signed) J. B. BALLANTINE.
ict SOC
Ag
Pest ete 3h
[ENCLOSURE]
DUNDERLAND %IhOh Onl CO., Ltd.
Minutes of a Mecting of the Works Committee held at FPitzgalan
House, Arundel Street, Strand, on Wednesday, Aucust 6th, 1903.
Present. Mr. Ainsworth (In the Chair) ir. Khodes, dir. Williams. in attendance. Mr. Pollen, ¥ Part of the Professor Louis, ° elas lr. Ballantine,
Mir. Wo Simin,
1. Minutes ¢f the Meeting cf the Committee held on Tuesday June 16th were read and signed. ae Grondal System cf priquetting.
Prof. Louis' Report dated July 20th on the recent visit and experiments made with the Grendal System of briquetting at ilerrang, and Hr. Ballantine's report dated August 5th on the same subject were read,
The main difference in the conclusions of these two revorts ig on the question of whether "added fines" are a necessity in making these briquettes, but there was a concensus of opinion that the addition of fings would probably sive a harder and stronger briquette. After careful consideration of ali te points raised in tne reports the Committee make the following recommandations to the Board:~
l. THAT THE GRONDAL FURNACE BE ADOPTED For BURNING OF BRIQUETTES MADE BY THE GOMPANY.
As regards the size of furnace the Committea recommend :-
(a) It shall be of sufficient width to permit of taking a
car 4 fest 6 inches to 5 fect wide.
The reason for the present breadth of the car (3ft. ) é
in use at Herrang is stated to be that the men placing the
-1-
[ENCLOSURE]
briquettss on the car work on one side of it only and are therefore unable to cover a greater breadth. Arrangements will be made for men to work on hoth sides with the broader car.
(b) ‘That the furnaces be built in units of four tunnels of the broader type. Certain other modifications of con- struction cic. to be censidered by tr. Simpkin when preparing his general plan.
2. SHAT THE COMPANY ADOPY THK MOULD PRESS FOR MAKING BRIQUETTES,
The Committee make this recommendation because it appears to be proved beyond a doubt that the briguettes made under hign pressure are superior to those made with tne present press used in the Grondal process which is a drop press.
oe THAT THE BRIQUETY! is A SQUAW BEE QUE SIMILAR IN SHAPL AND WHIGHT:’ 70 THE PRSENT GRONDAL BRI QUENT BUT WITH Te CORNERS ROUNDED OFF AND THAT FOR THE PRESENT HARD LABOUR BI USED TO PLAC THWSE BHIQUBTZES OW THE CARS.
The Committee make this recommendation hecause they considér it of the very highest importance that the Company do
not adopt at the commencement of their working a method which is
experimental,
The question of whether briquettes made under high pressure can be automatically dimped on to the cars has not been satisfactorily demonstrated although there seems a strong | Probability that this cm be done. here is, however, no /, doubt that the use of hand labour ensures a good briquette and the Comnittee is of opinion that to dump the briquettes automatically would be to rum the risk of Placing an. inferior briquette on the market and jeopardising the sale of the Company's product. For economical handling, the larger ana square briquette is necessary: for automatic dunping, the
-2-
eget?
[ENCLOSURE]
smaller und cylindrical will ve required. Should it be nerearter found by experiments that an econcmy can be effected by the wutomatic dunping, and that tne cylindrical briquette will stand.. being carried on a conveyor to the cars and dumped, it is understood that the same Mould presses can be utilised, it being only necessary to change the dies and Plungers.
4. THAT THE WHOLE OF THI CONCENTRATES USED RE REGROUND 50 AS TO GIVE ADDED FIwis.
The Committee make this recemasndation because it has been proved that added fines give a satisfactory result whereas the briquetting without added fines although quite possible has not been satisfactorily demonstrated.
Whether additional fine grinding rolls are placed at Storfoshei or at Guldsmeavik may be left for further eensidera- tion dependent on Hr. Simpxin's rerort as to whether the necessary plant cun he put dom at Storfoshei without serious disarransement of the Plans on which the work at that place is new proceeding,
The question of regrinding the magnetite only as it
comes from the inagnetite Separators was discussed but the
muy difficulties to contend with and no apparent advantaze to
i , ' Coumittee have come to the conclusion that there are too | H be gained in the way of increased purity of concentrate,
ao
[ENCLOSURE]
August 31, 19035,
The WORKS COMMITTEE, Dundurland Ircn Ore Ce., Fitgalan Hes,
Arundel Street, Wicd,
Dear Sirs,
Acting under your instructions, I proceeded on July 8th to Herrang to join Prof. Louis and Mr. Ballantine in an investicution ef the work of the Grondal furnace. I arrived at Herrany after tre work of actually forming the briquettes of tue Dunderlund concentrata had been comolested and just as soms of them were about to be taken out of the furnace, Beth Prof. Louis and Mr. Bullantine Kindly put me abreast of all they nad dene up to the tive of my arrival ana I have alse had an Opportunity to read their reports und listen te the discussicn ef the same at your meetine.
I agree with them in that satisfactory bricuettes were produced by the Grondal furnace from thre Dunderland con~
eesntrate of different proportions as stated in Mr. Ballantine's
resort and as show by the samples submitted to vour Beara. f ' also apres with the sugsesstion that should we adopt the Grondal
i Furnace, tney ought to be made wider and longer. i
Whether they are to be erected in batteries of four or
six, or singly, I think is a matter that camet well he /
determinad until the whole seheme, cost ef construction and cost : foe
of handling the material, has been thorourhly worked out. a
I do not agree with the cost of briquetting as set forth in Prof. Louis! report, as my calculations show not less than five pence per ton for labour only, not including the men at the gas producer, and this is based on working three shifts per day of each sisht hours, and paying the men Kr.3 per shift. ‘
Mr. Grondal in his English completed patent specifi-
cation No:18429, July 10, 1902, says, -
—_
na
[ENCLOSURE]
"I find that if tne ore is sufficiently sub-divided it may he broucht into the form of blocks by mixing it with water and stamping it into bricks which are immediately burnt in a suitable furnace."
Prof. Louis says, -
"The more finely cround the ore the better are the resulting briquettes,"
It is very unfortwmate that the Grondal people tampered with our concentrates before the arrival of Prof.Louis and Mr. Ballantine, which however they did in direct opposition to our instructions and fer reasons oniy known tc tnemselves
Mr. Ballantine seys, - "They mixed the hematite and macnetite concentrate together and ground up 30% of it to fines before our arrival at Herrang."
It is not clear to me whether this means they vroiund un 30% of the concentrate to try and make fine, or they inaginc they actually produced 30% of fines, as after this mixine and grinding it was hardly possible to find how tne concentrate stood with respect to ths supposed fines. I understand wet
erinding in a ball mill was the process adopted, and if so I do
not hesitate to assert that little or no extra fines were pro- duced from our ore. After nematite has besn eeauase toa
certain size, it would te nardly possible to erind it finer in
any mill such as they at present have at Herrang. Marmmetite
is somewhat more amenable to reduction and if a small portion of }
;
fines of magnetite were produced in the grinding, I am sure they i, were afterwards washed away. I will go further and Bay that Our concentrate, after treatment by the Grondal people in their mill, which concentrate was afterwards made into briquettes by Prof. Louis and Mr. Ballantine, had less fines than the original concentrate as shipped by us.
As before stated, it is a pity our concentrate was tampered with as it prevented any comparison being made between
-2-
[ENCLOSURE]
the relative fines of the Dunderland and Herrang concentrates and the amount of what is termed “added fines", Mr. Grondal is wedded to 'added fines' and Prof. Louis advécates the same but evidently without having used any means to find out the actual amount of fines which he says need to he added to the Dunderland concentrate, nor does he say the amount of fines which they assert is used with the Herrang ore. As far as i can gather he has simply asreed with the statement made by Mr. Grondul, and neither of them have said what "fines" are,
I do net agree with Prof. Louis in his statement - "that cae more finely eround the ore the better she resulting briquettes" - as my experience has show me that you can grind the concentrate so fine that tie briquettes in passing through the furnaces will burst open owing to the impossibility of the steam formed from ths moisture in tne briquett being able to escape, A proper anount of fines, cr as Mr. Grondal puts it - sub-division - is necessary, and I claim that we have in our
present concéenicate all the sub-division we need.
Our concentrate is ground so that it will pass throuch
a .018 screen, and therefore is .016 and less. tT shall be
Pleased vo shew tne Comnittee that with our concentrate, having & mixture cf 70% hematite and 30% magnetite, over 45% will pass through a .007 screen, and less, and that of the magnetite con~
centrate alone, more than 50% will pass through a .007 sergen,
and less. I have been given to understand that when Mr.Grondal
first attempted to mare briquettes of the Dumderland concentrate,
hematite alone was sent to him, and as pure hematite contains much less fines than our regular run of concentrates, I think this has prohably caused him to bring up this matter of added
fines.
q 3 q
4 --
OS BI eas,
[ENCLOSURE]
f£ understand Mr. Grondal crushes his ore and then separates it, and afterwards grinds a certain proportion inte What née calle "fines", but I doubt very much from what I saw when at Herrang whether there are more actual fines dn vue Grondal concentrate as it goes to the briquetting press than in our general run of concentrate. Grondal's concentrave, I feel sure, is not originally ground as fine as ours, and it is for this reason he must use added fines.
To put in a set of re-rrinding rolls, with the attendant motora, conveyors, ete. will cost about £4000. it will cost not over £1060 for one ot athe Committee to go to Herrang with Mr. Ballantine and see briquettes made from our concentrate on tne improvised press which is still there, with the additvson of water only ag a hinder, and with no added fines, tne rentvleman eculd first accompany Mr. Ballantine to Richmond and see our concentrate hoxe@ in the proportion of 70% hematite and 30% magnatite, and these boxes cculd te afterwards sealed and gent to Herrang to avoid any tampering with their contents, and I can assure you that if this is done you will see more satisfactory briqueltes wade than Mr. Grendal is now producing witn his alleged addition of tines. |
Water has baun uscd as a binder in briquetting many substances, and there is nothing new in its use. Mr.
Ballantine when at Pittsburg, at my request, made briquettes on j the Mould machine out cf the regular Dunderland concentrate and : without any addud fines, and these briquettes could casily be handled as they came from the machine and without having to use & trowel to lift them as is the case with those made by the Grondal press when using the Herrang concentrate.
I may add that I am reasonably sure we can automatic- ally handle briquettes made from our regular concGntrate if of the proper form and made with a proper press, but I entirely agree with your recommendation that it is better to remove the
briquettes from the machines by hand until we have had an
pe AN a tg er eh ata 2 seat WES So Sues
[ENCLOSURE]
opportunity to try the automatic handling in actual practice. My conclusions therefore are, -
L. That the Grondel furnace will work with the Dunderland ecncentrate te ow entire satisfaction,
2. That the furnaces should be made wider and longer go that we gan handle at least 3000 lbs. of briquettes per car, pulting in and taking out a cur every 15 minutes and cnly using 20 tunnels,
ey
o« That high pressure in the briquetting machine is
absolutely necessary to broduce & satisfactory briquett. 4, That cnly a certain acount of sub-divisica is required
aene Dunderland concentrate to make satisfactory briquettes
a
aid woav in our regular conesntiaie as it will 60 UO Line
brigquetting machine we hevs wll the sub-division necessary and #2 dO NO’ nesd to re-rrdindg tor added fines.
5. That Mr. Grondal, if we decide to use his furnace, shall furnish full working drawings of the prooosed furnaces,
with the changes as set forth, and that afterwards if we heave
any altarutions te sucpest, the same shall be sunpmitted to him
i |
for his avproval.
Yours truly,
(Signed) Wn. SIMPKIN,
September 1, 1903. P.S, Since writing the above report I have received from Capt, S.H. Pollen a box of the Herrang concentrate, with the "added fines", just as it g0es to the briquetting machine, which was sent here by Mr. Grondal. We have carefully dried, screened, and weighed the same, with the following resultsa:- 6% of the concentrate was left on a .018 screen ; 54% of the concentrate was left on a .007 screen;
40% of the concentrate passed throush a .007 sereen.
“5 h
shail, ate poe : a ae H
[ENCLOSURE]
We carried out the same experiment with the regular Dunderland concentrata - 30% magnetite and 710% hematite - with the follewing results:-
All of the concentrate passed easily throuch a .018 screen.
48% of the concentrate was left on a .007 screen;
52% of the concentrate passed throuch & .007 screen, Thus it will be seen that my surmise is correct and “ve have more fines in our regular concentrate thun the Herrang concen- trate has “ith its "added fines".
This experiment was carefully made three separate times by a man accustomed to laboratory work and the concentrate in each case was passed the sane nimber of times over the screens.
We shall be pleased to repeat these experiments for the Committee uv any time us 1 thins they conclusively show. us that we do not need added fines and therefore’can save the
expense of the extra set cf rolls, ete.
=
ALL LETTERS SHOULD BE ADDRESSED: ENGINEERING DEPARTMENT.
TELEGRAMS: STANCOLLI,LONDON.
ieee
CR OY
undlel Seeets >, ade WG,
September 8, 2903.
wi Hepler
THOMAS A. EDISON, Tsq. zi a
Fnclosed please find blue print F.322 which kindly
No: 30.
Dear Sir,
substitute for the B.$22 sent you the other day witn the other
Blower prints. You will note that I have changed the number of plades from six to eight which will give amore even current and not so many pulsations.
We are also mailing you under separate cover a set of prints of the 7 ft, Rolls as follows:-
C.105. 106, 114, 131.
B.121, 122, 123, 124, 125, 151, 152, 133, 134, 155, 153, 162, 216,
O15.
Yours truly,
ms Rewapadins
: iar | wreceitece: Cone eo S
V4 / ‘ , ky ne ios 2 a Bnddra Cie 0b ftouwttOW Sjdtenl g oy g ALL LETTERS SHOULD BE AODRESSED:.-- Sulja Ae ae Sack col:
ENGINEERING DEPARTMENT.
TELEGRAMS: STANCOLLI,LONDON.
Ae on Wc,
No: 31, September 26, 1903,
THOMAS A. EDISON, Esq.
Dear Sir,
Since sending you the drawings of the Blowers I have decided to make the shell of the blowers of 4" material, stiffened where necessary with angle iron, instead of out of 1/16", This adds very little to the cost of labour and will make a much superior job.
We have completed the small set of Fine Grinding Rolls and are now putting them in at the Laboratory. We shall build @ blower exactly of the size which we purpose using at Dunderland and shall be able to carry out some very interesting experiments s0 as to find out the proper speed and also the best position for the baffle plates, and to decide what number and size of screens we must use to equalise pressure.
The General Meeting of the Dunderland Company was held on the 24th, a report of which will be sent to you, and I will simply say here that everything passed off very smoothly and what the board has done met with the approval of the stock- holders,
The Dunderland Iron Ore Co. have finally decided to use the Gréndal process for briquetting and have given instruction to take up this work with Mr. Gréndal. When I have same in a condition to send to you, I wili mail you a complete set of the drawings so that you can see exactly what the whole scheme is, and it may be if you should eventually put up a concentrating and briquetting plant in th States, it will be advantageous to use this or a similar process. .
It is very likely that I shall make a trip over to see you early in the coming year, as I hope by that time to have everything crystalised, for when I go to Norway it is my intention ' to remain with the plant continuously until it is in operation. ;
So far, everybody who has worked with me is very enthusiastic about the work, and I have no fear about bringing it ‘to @ successful issue. ,
Awaiting your favours, I an,
Yours most truly,
——
o
SKindard Conthiuclion’ 20UfvOUMIOM temnallec: ‘ Gp x J — ALL LETTERS SHOULD BE ADDRESSED: ~ Sulga Cede Deundel Ll;
ENGINEERING DEPARTMENT. ; Io, TELEGRAMS: STANCOLLI,LONDON. — : 3 at O74 LOVZW.C. To: 32. September 28, 1973.
THCMAS A. BDISON, Jsq.
Dear Sir,
Confirming my late letter, I enclose you herewith a copy of Prof. Louis' report on briquetting which was read before the ganeraa ileeting of the Dunderland Iron Ore Co. as I think it may be of interest to you. a
Yours truly,
‘yy S rae
(ppg rene pee rer
-- i ——
i
| | | | { 1
{
}
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4
[ENCLOSURE]
tok Ctl, 4G, Hetsd Ck 2b Hes
Copy of a lettor from Professor Louis to the Chairman and Directors of the Dunuerland Iron Gre Co. Luc. uateu Sept. btn,
eee cerarare ner:
Gentlemen, I beg herewith to report summarily upon the Briauetting Process, which if now unuer your consideration:
the finely ground concentrate produced by the Zdisen
process, and consisting as you are avare, of a mixture of
specular hematite anu magnetite, ia moistened wi th 7 to 8% of w water, and is moulded into blocks about 6 inches square by
3 inches deep, under a powerful press. These locke are transferrea to iron cars dovense with Pirebrick, upuu waicn
they are passed through a tunnel-like furnace about 160 foet long, in which they are heated up to a temperature oe sbout 1300° Centigrade. The furnace is gas-fired, the air necdeu
for combusticn being heatea by passing over the burnt briquettes, which are thus at the same time cooled, The result is that a marked economy of heat is attained, tne consumption cf coal being under 5% of the weight of the briquettce.
I have watched the proces: in operation on threo separate cccasions, spending cach time several uays at the works. Two such briquettin, plante have been in operation Por some time in Sveden with very satisfactory revults, working howevor upon magnetite alone. The works which I visited have maao over 2000 tons of these briquettes, a considerablo quantity of which have been shippea to this country; tnoy proved to be of ample strength ana haraness, arrived in good condition, and gave entire satisfaction. My experiments have shewn that Dunderl and Ore can be briquettc2 as successfully as magnetite in this way, avery Slightly higher temperature alone being nocded. ‘ I had about a ton of briquettes mado from Dundorland ore, which were shippod home and wore quite satisfactory.
The rurnaco is simple in construction, so that tho plant.
is relatively inexpensive, the costs for fuel and labour are
“by no means high, and as far as can be judgoa, ropairs anu renewals
i. a
[ENCLOSURE]
-2.
Should not form serious itoms. The briquettes prouueuu appuar
to fulfill all requirements of Strength and porosity, and are
Superior to any others I have yet Seen. The process is thorefora
in my opinion quite Satisfactory.
I am, Gentlomen, Yours obediently, (Sed. )} Honry Louisa.
&
K.A., A-R.S.M., F.1.0., F.G.S8., ote.
Professor of Mining.
. arte ea « wk “ a ae “ ' a Aad a a iY + (a os in nw at
~m_e
CU ; Eb, Gy ae Lapgat SS f -orftoralion- Limeléd;
G CK ALL LETTERS SHOULD BE ADDRESSED: — Lilgalan: Mouse; Lise Deel
ENGINEERING DEPARTMENT. Se TELEGRAMS: STANCOLLI,LONDON. eZ OWMAOIL WC. No: 33. September 30, 19035.
THOMAS A; EDISON, Bsq.
Dear Sir, Re. Fine Grinding Rolls.
I would like to know if you have found it necessary to arrange for oiling the blocks which carry the bearings for these rolls? I mean the blocks between the top and bottom girder as they are almost constantly moving ~slightly, it is true, - ‘Wailst the rolls are in operation.
Yours truly,
| eee eee | } / ee. wha ee
[TO WILLIAM SIMPKIN. OCTOBER 12, 1903]
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