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[D7719ZCC], Letter from Thomas B A David to Thomas Alva Edison, September 21st, 1877

Title: [D7719ZCC], Letter from Thomas B A David to Thomas Alva Edison, September 21st, 1877
Editor's Notes: Does not get satisfactory results -- discusses what he has done to improve quality of sound, includes drawing
Author: David, Thomas B A
Recipient: Edison, Thomas Alva
Mentioned: Bell, Alexander Graham
Date: 1877-09-21
Type: Letter
Subject: Testing and quality control; Telephone
Folder ID: D7719-F
Microfilm ID: 14:943
Document ID: D7719ZCC
URL: https://edisondigital.rutgers.edu/document/D7719ZCC
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 14