The Thomas A. Edison Papers Digital Edition

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Metadata

Title

[D8845AEN], Letter from John Birkinbine to Thomas Alva Edison, October 15th, 1888

Editor's Notes

"As I promised you, I send the resluts of the chemical analyses made from crude ore, concentrates and tailings of the Fort Henry ores tested by your magnetic separator. These are all that I have at present, but I may obtain some more at the mines which I expect to visit shortly, these I will communicate to you. ### Results of Concentration of Edison Magnetic Separator ### Mr. S. S. Witherbee, took samples in January of concentrates from a small experimental plant and found ### Phosphorus 0.30 ### Phosphorous 0.32 ### 0.31 average ### Mr. Wilkinson took samples in May 1888 at Edison's laboratory of Old Bed and New Bed ore mixed as received, which were analyzed by Ledoux & Co. ### Crushed to 10 mesh showed. Phosphorus 0.283 ### " " 20 " " Phosphorus. 0.183 ### Analyses of Port Henry ores used in experiments made by Edison's magnetic separator at Orange, N.J. May 25th 1888. In pressence of Messrs Birkinbine and Witherbees, Sherman & Co. T.R. Woodbridge, Chemist. ### [table of iron and phosphorus amounts follows] ### Analyses of Port Henry ores used in experiments made with Edison magnetic separator at Orange, N.J. May 29th, 1888, during Mr. Birkinbine's first visit after above analyses. ## [table of iron and phosphorus measurements follows] ### Analyses of ore crushed by Cornish rolls at Rockaway N.J. and separated by Edison, July 3rd, 1888, ### [table of iron and phosphorus measurements follows] ### Analyses of Port Henry iron ores, crushed and separated by Edison. ### [table of iron and phosphorus measurements follows] ### Conkling Separator ### The following analyses were reported to me as the result of a trial of New Bed Lean ore with the Conlking magnetic separator. ### [table of iron and phosphous measurements] ### The same machine passed the Mr. Sops. N.. Ore, and obtained the following results. ### [table of iron and phosphorus measurements] ### Wenstrom Separator ### Messrs Scranton & Cook supplied the following as the results which were obtained with the Wenstrom separator, Crushed to 20 mesh, Austen & Wilber analysts, Beach Glen. N.J. ore. ### [table of iron and phosphorus measurements] ### The machine is a cylinder with alternate bars of soft iron, and of wood, forming the periphery; within this cylinder and nearly touching the periphery is a wound magnet, the claim being that alternate positive and negative ploss[?] are secured. ## The ore is fed by a hopper, the magnetite sticking to the cylinder revolves with it, and drops off beyond magnetic field, the tailings falling from the face of the cylinder. ### I will come over to the laboratory within a day or two and go over results with you. ### The following is an analysis of Chataugay New York Ore separated by the Wenstrom machine. ### [table of iron measurements follows]" Yours truly, Jno. Birkinbine {PI-I think these tests are included in the joint paper TAE and Birkinbine published PA019]

Author

Birkinbine, John

Recipient

Edison, Thomas Alva

Mentioned

Witherbees Sherman & Co

Date

1888-10-15

Type

Letter

Subject

Metals and minerals

Ore milling and separation

Chemicals, chemical products, and chemical processes

Folder ID

D8845-F

Microfilm ID

123:1009

Document ID

D8845AEN

URL

https://edisondigital.rutgers.edu/document/D8845AEN

Rights

Thomas Edison National Historical Park

Publisher

Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University

License

CC0 1.0 Universal

Has Version

Archive.org Viewer, Microfilm Series Reel 123

Item sets

[D8845-F] (D-88-45) Mining