[D8123ZBC], Letter from Francis Robbins Upton to Thomas Alva Edison, April 21st, 1881

https://edisondigital.rutgers.edu/document/D8123ZBC

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Title

[D8123ZBC], Letter from Francis Robbins Upton to Thomas Alva Edison, April 21st, 1881

Editor's Notes

Yesterday tested a run of carbons, consisting of 371 A and 663 B carbons; all good except for 15. Problems with making lamps in double stocks, including poor vacuums. IE; placing two lamps on vacuum pump at same time. Also new employees with little experience has led to some spoilage. With present state of pumps must run at night also to get 1000 lamps a day produced. Consider for inclusion: gives view of early production processes and problems. (DH)

Date

1881-04-21

Decade

1880-1889

Type

Folder/Volume ID

D8123-F

Microfilm ID

57:859

Document ID

D8123ZBC

Publisher

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