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[NV14005], Technical Note, Thomas Alva Edison, Charles Batchelor, January 6th, 1878

Title: [NV14005], Technical Note, Thomas Alva Edison, Charles Batchelor, January 6th, 1878
Editor's Notes: Model No. 3 four diaphragm speaker w/polarizing magnet for diaphragms using weird diaphragms maybe [modification of Bell]; also pp. 6, 8
Author: Batchelor, Charles; Edison, Thomas Alva
Date: 1878-01-06
Type: Technical Note
Subject: Telephone
Folder ID: NV14-F
Microfilm ID: 4:154
Document ID: NV14005
URL: https://edisondigital.rutgers.edu/document/NV14005
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 4