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[NS7802N], Technical Note, Charles Batchelor, John Kruesi, July 17th, 1878

Title: [NS7802N], Technical Note, Charles Batchelor, John Kruesi, July 17th, 1878
Editor's Notes: megaphone?
Author: Batchelor, Charles; Kruesi, John
Date: 1878-07-17
Type: Technical Note
Subject: Microphone and other acoustic devices
Folder ID: NS7802-F
Microfilm ID: 7:771
Document ID: NS7802N
URL: https://edisondigital.rutgers.edu/document/NS7802N
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 7
License: CC0 1.0 Universal