[D7941ZDA], Letter from Edward Hibberd Johnson to Thomas Alva Edison, July 23rd, 1879

Item

Abstract

Call bell battery problems. Resistance of bell mags too low. Will try 100 ohms. If this successful, will change magnets on all switchboards. Describes expts.

Date

1879-07-23

Decade

1870-1879

Type

Identifier

D7941ZDA

Folder Set

D7941

Title

[D7941ZDA], Letter from Edward Hibberd Johnson to Thomas Alva Edison, July 23rd, 1879

Microfilm ID

52:641

Publisher

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