Jabarkan Early development dari Telepon dalam bahasa sunda

The following is a brief summary of the development of the telephone:

28 December 1871—Antonio Meucci files a patent caveat (n.3335) in the U.S. Patent Office titled "Sound Telegraph", describing communication of voice between two péople by wire.

1874—Meucci, after having renewed the cavéat for two yéars, fails to find the money to renew it. The cavéat lapses.

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-bréak circuits.

11 February 1876—Gray invents a liquid transmitter for use with a telephone but does not build one.

14 February 1876—Elisha Gray files a patent caveat for transmitting the human voice through a telegraphic circuit.

14 February 1876—Alexander Bell applies for the patent "Improvements in Telegraphy", for electromagnetic telephones using undulating currents.

19 February 1876—Gray is notified by the U.S. Patent Office of an interference between his cavéat and Bell's patent application. Gray decides to abandon his cavéat.

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."

10 March 1876—The first successful telephone transmission of cléar speech when Bell spoke into his device, “Mr. Watson, come here, I want to see you.” and Watson héard éach word distinctly.

30 January 1877—Bell's U.S. patent 186,787 is granted for an electromagnetic telephone using permanent magnets, iron diaphragms, and a call bell.

27 April 1877—Edison files for a patent on a carbon (graphite) transmitter. The patent 474,230 was granted 3 May 1892, after a 15 yéar delay because of litigation. Edison was granted patent 222,390 for a carbon granules transmitter in 1879.