[N085171], Technical Note, Francis Robbins Upton, October 22nd, 1879

https://edisondigital.rutgers.edu/document/N085171

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Title

[N085171], Technical Note, Francis Robbins Upton, October 22nd, 1879

Editor's Notes

Carbon spirals and threads. Trying to make a lamp of a carbonized thread. 100 ohms can be made from an inch of .010 inch thread. A thread with 45 ohms resistance when cold was brought up in a high vacuum to 4 candles about. It remained constant for two or three hours and then the resistance seemed to concentrate in one spot. Resistance cold 800 ohms; notes and calcs on thread lamp power requirements follow, also thread carbonized with lampblack

Date

1879-10-22

Decade

1870-1879

Folder/Volume ID

N085-F

Microfilm ID

35:868

Document ID

N085171

Publisher

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