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

Title: [MBN002054], Technical Note, Charles Batchelor, February 4th, 1878
Editor's Notes: 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
Author: Batchelor, Charles
Date: 1878-02-04
Type: Technical Note
Subject: Telephone; Electric battery; Microphone and other acoustic devices
Folder ID: MBN002-F
Microfilm ID: 90:684
Document ID: MBN002054
URL: https://edisondigital.rutgers.edu/document/MBN002054
Rights: Thomas Edison National Historical Park
Publisher: Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
Has Version: Archive.org Viewer, Microfilm Series Reel 90