[D8416ALB], Letter from Thomas Alva Edison to W R Edelen, February 8th, 1884
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Title
[D8416ALB], Letter from Thomas Alva Edison to W R Edelen, February 8th, 1884
Editor's Notes
Re: yours of 4th, I use a pump that reduces pressure to 1/50 millionth of atmosphere. Lamps don't last longer at higher evacuations. Pump costs about 75 cents.
Author
Recipient
Date
1884-02-08
Type
Subject
Folder/Volume ID
D8416-F
Microfilm ID
71:1014
Document ID
D8416ALB
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University