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Antonio Meucci introduces the telephone
An early voice communicating device was invented around 1854 by Antonio Meucci, who called it a telettrofono. In 1871 Meucci filed a caveat at the US Patent Office. His caveat describes his invention, but does not mention a diaphragm, electromagnet, conversion of sound into electrical waves, conversion of electrical waves into sound, or other essential features of an electromagnetic telephone. -
Johann Philipp Reis first person to produce a working electromagnetic device
n 1860 Johann Philipp Reis was the first to produce a functioning electromagnetic device that could transmit musical notes, indistinct speech, and occasionally distinct speech by means of electric signals. Reis also introduced the term "telephon" for his device. -
alexander graham bell invents the telephone
Alexander Graham Bell is commonly credited as the inventor of the first practical telephone. The classic story of him saying "Watson, come here! I want to see you!" is a well-known part of the history of the telephone. This showed that the telephone worked, but it was a short-range phone.[18] Bell was the first to obtain a patent, in 1876, for an "apparatus for transmitting vocal or other sounds telegraphically", after experimenting with many primitive sound transmitters and receivers. Bell was -
telephone exchange
The telephone exchange was an idea of the Hungarian engineer Tivadar Puskás (1844–1893) in 1876, while he was working for Thomas Edison on a telegraph exchange. Puskás was working on his idea for an electrical telegraph exchange when Alexander Graham Bell received the first patent for the telephone. -
Elisha Gray recognized the lack of fidelity of the make-break transmitter
Elisha Gray recognized the lack of fidelity of the make-break transmitter of Reis and Bourseul and reasoned by analogy with the lover's telegraph, that if the current could be made to more closely model the movements of the diaphragm, rather than simply opening and closing the circuit, greater fidelity might be achieved. Gray filed a patent caveat with the US patent office on February 14, 1876 for a liquid microphone. The device used a metal needle or rod that was placed – just barely – into a l -
important 3 tests
Only a few months after receiving U.S. Patent No. 174465 in the beginning of March 1876, Bell conducted three important tests of his new invention and telephone technology after returning to his parents' home at Melville House (now the Bell Homestead National Historic Site) for the summer. The third and most important test was the world's first true long distance telephone call, placed between Brantford and Paris, Ontario on August 10, 1876 -
thomas edison makes adjustments
Thomas Alva Edison took the next step in improving the telephone with his invention in 1878 of the carbon grain "transmitter" (microphone) that provided a strong voice signal on the transmitting circuit that made long-distance calls practical. Edison discovered that carbon grains, squeezed between two metal plates, had a variable electrical resistance that was related to the pressure.
