[NS79AAG1], Patent Application, Thomas Alva Edison, July 17th, 1879
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Title
[NS79AAG1], Patent Application, Thomas Alva Edison, July 17th, 1879
Editor's Notes
Undated draft of patent 231,704. Receiver is same as previous except it's placed in tertiary circuit "to keep the apparatus free from earth currents which cause alteratios in the volume of sound owing to the marvellous delicacy of the apparatus." Claims method of connecting buttons to circuit; rubber transmitter cover; use of primary & secondary coils in transmitter; receiver's palladium-tipped pressure arm; call battery; receiver. [Receiver tertiary circuit not in claims of this draft.]
Author
Mentioned
Date
1879-07-17
Decade
1870-1879
Type
Subject
Folder/Volume ID
NS79-F
Microfilm ID
162:714
Document ID
NS79AAG1
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University