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[PT032AAY], Patent Application, Thomas Alva Edison, May 22nd, 1888

Title: [PT032AAY], Patent Application, Thomas Alva Edison, May 22nd, 1888
Editor's Notes: Pat. App. 400,646 Objective is to produce a diaphragm for the recorders and reproducers of phonographs, one which will maintain its adjustment and give maximum effect under various condition. Employing a film or membrane of glass or its equivalent porcelain as the diaphragm the difficulties encountered are overcome. [1 fig; 4 claims] Becomes US Pat. 400,646
Author: Edison, Thomas Alva
Date: 1888-05-22
Type: Patent Application
Subject: Carbon, coal, glass, ceramics; Cylinder recording & reproducing apparatus
Folder ID: PT032AAY-F
Microfilm ID: 114:331
Document ID: PT032AAY
URL: https://edisondigital.rutgers.edu/document/PT032AAY
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 114

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