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[X163A], Letter from Thomas Alva Edison to George Frederick Barker, December 28th, 1885

Title: [X163A], Letter from Thomas Alva Edison to George Frederick Barker, December 28th, 1885
Editor's Notes: Notes on and drawing of an acoustic device employing a double wheel; materials include wood, leather rings; rosin; "The rosin'd Leather gave tremendous Longitudinal vibration. Spring S was very heavy so as to permit amplitude so to speak to the Longitudinal movement."
Author: Edison, Thomas Alva
Recipient: Barker, George Frederick
Date: 1885-12-28
Type: Letter
Subject: Microphone and other acoustic devices
Folder ID: X163-F
Document ID: X163A
URL: https://edisondigital.rutgers.edu/document/X163A
Rights: Library of American Broadcasting
Publisher: Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University