[D8518G], Letter from John Trowbridge to Thomas Alva Edison, March 30th, 1885
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Title
[D8518G], Letter from John Trowbridge to Thomas Alva Edison, March 30th, 1885
Editor's Notes
I already owe you for the lamps you sent me, so I hesitate to ask another favor so soon, but I don't know where I can get the following apparatus except through you. The thermo-electric arrangement you placed inside one of your lamps for me is not [-------] enough. Could you have a very fine strip of platinum or steel placed at the center of one of your 16 candlepower lamps? "My idea is to get the temperature inside the lamp by the principle of change of resistance of this thin platinum wire or strip. I wish to have in this way a check upon a standard of light." I hope to be able to determine the temperature at th emoment the candlepower of the lamp is measured. The platinum wire should be very fine. TAE Marg: "fine platinum wire 1/1000--John Ott or martin has it. Make it 1/2 or 3/4 inch long. Make 3 Lamps, send to Trowbridge." There are also three diagrams in the letter, two drawn by Trowbridge and one by TAE alongside his marginalia.
Author
Recipient
Mentioned
Date
1885-03-30
Type
Folder/Volume ID
D8518-F
Microfilm ID
77:499
Document ID
D8518G
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University