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

Item

Abstract

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.]

Date

1879-07-17

Decade

1870-1879

Identifier

NS79AAG1

Folder Set

NS79

Title

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

Microfilm ID

162:714

Publisher

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