[NS79AAG1], Patent Application, Thomas Alva Edison, July 17th, 1879

Item

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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.]

URL

https://edisondigital.rutgers.edu/document/NS79AAG1

Author

Edison, Thomas Alva

Mentions

Serrell, Lemuel Wright

Date

1879-07-17

Decade

1870-1879

Type

Patent Application

Subject

Acoustic telegraphy

Identifier

NS79AAG1

Folder Set

NS79-F

Microfilm ID

162:714

Rights

Thomas Edison National Historical Park

Publisher

Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University

Item sets

Unbound Notes and Drawings (1879)