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[NS7811F], Technical Note, Thomas Alva Edison, Charles Batchelor, June 21st, 1878

Title: [NS7811F], Technical Note, Thomas Alva Edison, Charles Batchelor, June 21st, 1878
Editor's Notes: telephone rubber -- followed by automatic current regulator with magnets and carbon -- followed by carbon repeater
Author: Batchelor, Charles; Edison, Thomas Alva
Date: 1878-06-21
Type: Technical Note
Subject: Telephone
Folder ID: NS7811-F
Microfilm ID: 7:920
Document ID: NS7811F
URL: https://edisondigital.rutgers.edu/document/NS7811F
Rights: Thomas Edison National Historical Park
Publisher: Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
License: CC0 1.0 Universal
Has Version: Archive.org Viewer, Microfilm Series Reel 7