[N320043], Technical Note, Thomas Alva Edison, April 21st, 1886


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[N320043], Technical Note, Thomas Alva Edison, April 21st, 1886

Editor's Notes

"Fundamental As Iron gives a jerk when heated by elec at about red heat and expands & contracts & also loses its magnetism or power to become magnetic about same point & I think reverses direction of current in Thermos at about same point (ascertain) and other metals don't, this shows that its molecules or atoms are closer together than other metals and have to be seperated by heat before they become like the other conductors not subject to magnetism, hence a slight electric current in Iron makes powerful attraction & scarcely none in other metals, perhaps certain metals if cooled down to 75 or 100 below zero & put in a powerful coil would shew magnetism Try Use rotating disck & solid carbonic acid & ether [this note probably related to development of pyromagnetic generator]



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