[LB028081], Letter from Alfred Ord Tate to William Kennedy Laurie Dickson, February 2nd, 1889
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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
Recipient
Mentioned
Date
1889-02-02
Type
Subject
Folder/Volume ID
LB028-F
Microfilm ID
138:828
Document ID
LB028081
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University