[D8123ZBO], Letter from Francis Robbins Upton to Thomas Alva Edison, May 6th, 1881

https://edisondigital.rutgers.edu/document/D8123ZBO

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Title

[D8123ZBO], Letter from Francis Robbins Upton to Thomas Alva Edison, May 6th, 1881

Editor's Notes

Favorable reports regarding heating the clamps. Testing on pumps require several days b/c many variables incl. weather, state of the mercury and so on. Recording results of 50 pumps, esp. time they take to evacuate lamps. Work on building furnace progresses well. Plans on using plaster of paris for sockets.

Date

1881-05-06

Decade

1880-1889

Type

Folder/Volume ID

D8123-F

Microfilm ID

57:877

Document ID

D8123ZBO

Publisher

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