[N023073], Technical Note, Thomas Alva Edison, February 22nd, 1879
https://edisondigital.rutgers.edu/document/N023073
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Title
[N023073], Technical Note, Thomas Alva Edison, February 22nd, 1879
Editor's Notes
conceived the idea of using a bobbin or iron wire wound on lime iwth mplatinum for the last layer the iron and platinum to be pyro-insulated by acetate of magnesia and the size and rest'nce of the iron made so that when it was at a bright yellow approaching white that the plaina should be incandescent. I effect this by using an iron wire slightly loarger than the platinum. made some tests with iron and platina wire joined together & placed between supported and heated with the battery. I find not the slightest difficulty in so selecting the size of the wires that hte pt shall be brilliantly incandescent whiule the iron is yello. Hence I can make a lamp with 1 inch of incandescent surface (pt) with a large resistance, the inner wire of iron losing all of its heat through the platina,, this is a gain in economy of plant.
Author
Date
1879-02-22
Type
Subject
Folder/Volume ID
N023-F
Microfilm ID
31:177
Document ID
N023073
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University