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[D8107E], Letter from James A Campbell to Thomas Alva Edison, January 20th, 1881

Title: [D8107E], Letter from James A Campbell to Thomas Alva Edison, January 20th, 1881
Editor's Notes: About to issue a work on mechanical hearing aids. Want sources for learning about your investigations in this line. Can principles of telephone be applied to defective hearing? Saw in 1878 clipping that Bell predicted possibility of hearing fall of shadow on a section of selenium in telephone circuit; is this true? [Mostly illegible TAE marg]
Author: Campbell, James A
Recipient: Edison, Thomas Alva
Mentioned: Bell, Alexander Graham
Date: 1881-01-20
Type: Letter
Subject: Telephone; Microphone and other acoustic devices
Folder ID: D8107-F
Microfilm ID: 57:398
Document ID: D8107E
URL: https://edisondigital.rutgers.edu/document/D8107E
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 57

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