[NM021AAC], Technical Note, Thomas Alva Edison, June 24th, 1887


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[NM021AAC], Technical Note, Thomas Alva Edison, June 24th, 1887

Editor's Notes

725 "Dick-- Patent, apparatus for seperating ores [drawings] X X is a closed chamber to prevent draught of air from disturbing the perpendicular fall of the fine particles. This chamber which is made of wood is in certain instances where the ore has to be ground very fine to liberate the gold is provided with gaskets & stuffing boxes and the chamber connected to an ordinary steam vacuum apparatus the air being continuously exhausted to 29 inch column of mercury. The residucal air being thus rarified does not appreciably effect the perpendicular fall of the particles unaffected by the magnet. A Bin G recieves the gold & non magnetic material & Bin N the magnetic material-- d is a straight fall box C is a revovling cylinder sieve, the fine particles from which fall into d and in passing downward are given a straight course before leaving the mouth of D-- as this has to be or s better to be placed near the pole of the magnet the magnetic particles in the ore are drawn to one side of d & clogg it, but a bar of iron a is placed on the other side of such a mass & in such a position that a counter attraction or balance is obtained & clogging is prevented. Claim-- closed chamber 2nd closed chamber exhausted 3rd altering trajectory in closed space 4 [altering trajectory in] vacuous space 5-- straightening fall box d 6-- Iron bar a 7 Rotating sieve in closed chamber etc. etc--"




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