[PT032AAG1], Technical Note, Thomas Alva Edison, July 27th, 1887

Item

Abstract

Dick-- Patent. The object of this invention is to prepare pyritious ores for seperation of their magnetic constituents from the other matter by my system of magnetic seperation shewn in patent _____ This being a link in the process of extracting gold from pyritious gangue; If have found that Bisulphide of iron or common iron pyrites is a very frequent gangue of gold ores and this is very slightly magnetic so that the most powerful magnets are required to alter the trajectory of the powdered material when falling. I have found that if the powdered pyrites be placed in a closed chamber and heated to a dull read heat the Bisulphide is reduced to protosulphide or fior and this increases its magnetism sufficiently to premit the use of less powerful magnets for its seperation. But if the operation of heating [following this is a complete draft in someone else's hand - see how this relates to Dickson's work up to this point]

Date

1887-07-27

Decade

1880-1889

Identifier

PT032AAG1

Folder Set

PT032AAG

Title

[PT032AAG1], Technical Note, Thomas Alva Edison, July 27th, 1887

Microfilm ID

114:101

Publisher

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