[D8123ZDX], Letter from Francis Robbins Upton to Thomas Alva Edison, September 23rd, 1881

Item

Abstract

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.

Date

1881-09-23

Decade

1880-1889

Type

Identifier

D8123ZDX

Folder Set

D8123

Title

[D8123ZDX], Letter from Francis Robbins Upton to Thomas Alva Edison, September 23rd, 1881

Microfilm ID

57:965

Publisher

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

Timestamp

September 23, 1881