The Thomas A. Edison Papers Digital Edition

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Metadata

Title

[LB028081], Letter from Alfred Ord Tate to William Kennedy Laurie Dickson, February 2nd, 1889

Editor's Notes

"Here is an extract just received from a letter from Mr. Mallory. The information may be of use to you:-##We take the sample to be assayed and put about a table spoonful between two hard wood boards and rub them well together so to separate all the particles. We find in twenty mesh that a great many pieces about 20 have considerable silica attached, and the grinding motion seems to separate them): then the product is sifted through a 60 mesh screen, and 100 grains weighed out: then it is spread very thinly over a paper, and with a small hand magnet which we cover with tissue paper so to enable me to take the iron off easily, we separate the iron, leaving the dust: the iron off easily we separate the iron, leaving the dust: the iron we spread out and separate two or three times according to the amount of dust and silica contained and then go over the dust again to get the iron out (usually find some in the dust) then weigh the iron and dust separately and allow for what is lost, usually about two grains and get the percentage of each. The iron percentage multiply by 72.40 and get the metallic iron and usually very rare and the result can be obtained in ten to fifteen minutes. By this we are enabled to keep very close track of our work." Yours truly, A.O. Tate

Author

Tate, Alfred Ord

Recipient

Dickson, William Kennedy Laurie

Mentioned

Mallory, Walter Seeley

Date

1889-02-02

Type

Letter

Subject

Ore milling and separation

Folder ID

LB028-F

Microfilm ID

138:828

Document ID

LB028081

URL

https://edisondigital.rutgers.edu/document/LB028081

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 138

Item sets

[LB028-F] LB-028 (Jan-Apr 1889)