[D8020ZEL], Letter from George Clark to Thomas Alva Edison, April 28th, 1880
https://edisondigital.rutgers.edu/document/D8020ZEL
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Title
[D8020ZEL], Letter from George Clark to Thomas Alva Edison, April 28th, 1880
Editor's Notes
Wrote earlier about his air pump; now perfected. Fully exhausts 9 cu inches in 3 min by hand. "Peculiar construction;" only 2 valves outside mercury cylinder. Interested in seeing?
Author
Recipient
Date
1880-04-28
Type
Subject
Folder/Volume ID
D8020-F
Microfilm ID
53:743
Document ID
D8020ZEL
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University