The Electric Telephone by Arthur Edwin Kennelly
Author: Arthur Edwin Kennelly
Published Date: 12 Jan 2010
Publisher: Nabu Press
Language: English
Format: Paperback| 440 pages
ISBN10: 1142608476
File size: 47 Mb
File Name: The Electric Telephone.pdf
Dimension: 189x 246x 23mm| 780g
Download Link: The Electric Telephone
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Jump to Electrical devices - 6 April 1875: Bell's U.S. Patent 161,739 "Transmitters and Receivers for Electric Telegraphs" is granted. This uses multiple vibrating steel reeds in make-break circuits, and the concept of multiplexed frequencies. 20 January 1876: Bell signs and notarizes his patent application for the telephone. 7 March 1876: Bell's U.S. patent 174,465 "Improvement in Telegraphy" is granted, covering "the method of, and apparatus for, transmitting vocal or other sounds telegraphically by causing electrical undulations, similar in form to the vibrations of the air accompanying the said vocal or other sound.
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