[NM020ABL], Technical Note, Thomas Alva Edison, November 7th, 1886


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[NM020ABL], Technical Note, Thomas Alva Edison, November 7th, 1886

Editor's Notes

"The object of this invention is to carbonize filiments for incandescent electric lamps which will be of even resistance and will not become distorted while heated electricaly while in the Lamp-- The invention consists of carbonizing the filiment entirely by radiated or convected heat, and not by conduction. The filiment is suspended out of contact with any body in a carbonizin chamber a small weight serves to keep it from distorting while being carbonized thus preserving the shape originaly given to the carbonized filiment [drawings] several hundred filiments in each mould Soak the patent, make broadest claims. Claim Carbonizing carbonizable filiments by radiated & convected heat-- Out of contact so no heat is conveyed to filiment by conduction-- Suspended filiment, bent or formed to shape originally & placed under strain while being carbonized to make it hold its shape-- P.S. The filiment used in Lamp is broken off about 1/4 inch from point of suspension so that it will be carbonized by radiation at this point & not by conduction from the support.-- all carbonization heretofore of every body The filiment was in contact with matter at some of its parts-- our [connected?] without exception use powdered charcoal. T.A.E. Where are the other applications??"



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