[NM031004A], Technical Note, William Kennedy Laurie Dickson, July 1st, 1887


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[NM031004A], Technical Note, William Kennedy Laurie Dickson, July 1st, 1887

Editor's Notes

"Sulphied of Iron and Copper dust were only partially sep. perhaps only 60% Iron Sulphide was saved. All substances were passed through the finext metal sieve about 90 mesh before falling past or through magnetic field-- Copper dust: no attraction or repoulstion, using an extra strong field. The same throughout these tests [made?]to fall within [4"?] of the poles-- White sand: no apparent atrtraction or repulsion same result as Cu dust. Copper dust & white sand-- No change at all, no wdiening or narrowing or separation of the Cu from the sand-- even when allowed to fall (without magnetic field) first in order to set the stream right on to the sharp edge of the dividor, dividing exactly by weidth the amount of san & copper mixed on either side. I finally succeeded in gettting 5 oz on each side Now carefully noting the adjustments and filling the sieve I turned on the current & so magnetizing strongly the field I found no difference in weight after separation of the Diamagnetic drawer or the Paramagnetic. This I tried several times with the same result, however I have planned to try this experiment again with the strongest concentrated magnet-- giving perhaps twice or three times as many lines of force per square inch of iron--"



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