[MU120], Letter from Thomas Alva Edison to Francis Robbins Upton, December 1887

Item

Abstract

"There are two ways of stopping this. 1st reversing lamp on pump--or heating clamp by a flame after it is perfectly dry. Reversing lamps for an instant would probably be better = as at right C.P. The clamp is brought to red or white heat almost instantly--Baking the lamps for 1/2 hour at 800 or even 750 ought to carbonize the geletin in the paste. Force [unclear] he touches the clamp with a flame but I consider this a dangerous practice, on the whole 9 advise that when you reach such an exhaustion as to work the lamp up high to heat the lamp that you alternate [unclear] instant on 1 clamp the other on the next arm this way work out [unclear] on 6 other [unclear] their work blue off on out clamp only a very simple plain switch could be made or you could work a whole row and work high then reverse the whole row + work high this would dispense with many switches."

Mentions

Date

1887-12-00

Decade

1880-1889

Type

Identifier

MU120

Folder Set

MU10

Title

[MU120], Letter from Thomas Alva Edison to Francis Robbins Upton, December 1887

Microfilm ID

95:836

Publisher

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