[D8123ZDX], Letter from Francis Robbins Upton to Thomas Alva Edison, September 23rd, 1881
https://edisondigital.rutgers.edu/document/D8123ZDX
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Title
[D8123ZDX], Letter from Francis Robbins Upton to Thomas Alva Edison, September 23rd, 1881
Editor's Notes
Thin fall tubes work well so far, but need more testing. Turning out 1100 lamps a day and hopes to get out 5000 by Saturday. Says reject rate of 5% due to bad vacuum seals and breakage of carbons.
Author
Recipient
Date
1881-09-23
Type
Folder/Volume ID
D8123-F
Microfilm ID
57:965
Document ID
D8123ZDX
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University