[MBSB21181], Letter from Thomas Alva Edison to Telegraphic Journal, March 27th, 1879

Item

Abstract

Letter to ed of Telegraphic Journal. Re earlier article on carbon rheostat. I used several hundred discs of silk saturated with carbon, providing greater range of resistance; "had I merely used powerdered carbon, as in the Clerac tube, it would have been a failure." Also objects to review of Prescott's book. Has numerous drawings of microphones made by amateurs, which resemble carbon telephone. "The ordinary carbon telephone may be adjusted to any degree of delicacy, and when so adjusted is as sensitive as the so-called microphone."

Date

1879-03-27

Decade

1870-1879

Type

Identifier

MBSB21181

Folder Set

MBSB2

Title

[MBSB21181], Letter from Thomas Alva Edison to Telegraphic Journal, March 27th, 1879

Microfilm ID

94:481

Publisher

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