[N020137], Technical Note, Charles Batchelor, Thomas Alva Edison, February 28th, 1879
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Title
[N020137], Technical Note, Charles Batchelor, Thomas Alva Edison, February 28th, 1879
Editor's Notes
These telephone drawings may be related to getting ready for Tel Interferences -- "go to page 155" for drawing labeled "Thermo telephone" subject of alloy tables?; motograph telephone made by Ott, condenser telephone, resistance telephone, these and others similar to those from 1877; fr. 1040 carbon button in a ring shellacked on rim
Date
1879-02-28
Type
Folder/Volume ID
N020-F
Microfilm ID
30:1036
Document ID
N020137
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University