[N018003], Technical Note, Thomas Alva Edison, 1879


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[N018003], Technical Note, Thomas Alva Edison, 1879

Editor's Notes

platina found in galena from 1834 Phil Mag; retention of magnetism proportinal to length of electromagnet, permanent magnetization of steel best effected by very long electromagnet 1833 Phil Mag; notes on efficiency of burning coal; Table of alloys crossed out; then another table of alloys begins sulphide iron with metals and sulphides of metals "This is one group of alloys with Sulphide of Iron-- Now substitute for Sulphide of Iron Sulphide of Copper & all through the table scratchingout Sulphide of Iron-- thence substituting for copper another Sulphide until the whole of the following list has been made to substitute Sulphide of Iron" zinc, tin, lead, nickel, cadmium, sodium mercury, tungsten, copper, antimony, bismuth if they can all be alloyed; then tabel of triple alloys; special compositions small bars and large bars, probably all alloys for thermopiles
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Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
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