[NV14005], Technical Note, Thomas Alva Edison, Charles Batchelor, January 6th, 1878
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Title
[NV14005], Technical Note, Thomas Alva Edison, Charles Batchelor, January 6th, 1878
Editor's Notes
Model No. 3 four diaphragm speaker w/polarizing magnet for diaphragms using weird diaphragms maybe [modification of Bell]; also pp. 6, 8
Date
1878-01-06
Type
Subject
Folder/Volume ID
NV14-F
Microfilm ID
4:154
Document ID
NV14005
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University