[MBN002054], Technical Note, Charles Batchelor, February 4th, 1878

Item

Abstract

battery designed to vary resistance with action of human voice either by pressure or by increase of surface of one pole; switch for induction coil on telephone; check stamping machine

Date

1878-02-04

Decade

1870-1879

Identifier

MBN002054

Folder Set

MBN002

Title

[MBN002054], Technical Note, Charles Batchelor, February 4th, 1878

Microfilm ID

90:684

Publisher

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