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[N030027], Technical Note, Charles Batchelor, April 9th, 1879

Title: [N030027], Technical Note, Charles Batchelor, April 9th, 1879
Editor's Notes: more chalk tests
Author: Batchelor, Charles
Date: 1879-04-09
Type: Technical Note
Subject: Telephone
Folder ID: N030-F
Microfilm ID: 31:907
Document ID: N030027
URL: https://edisondigital.rutgers.edu/document/N030027
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 31