A telephone is an instrument designed for the simultaneous transmission and reception of the human voice. Telephones are inexpensive and simple to operate, and they offer a… See more

The word telephone, from the Greek roots tēle, “far,” and phonē, “sound,” was applied as early as the late 17th century to the string telephone familiar to children, and it was later u… See more

As it has since its early years, the telephone instrument is made up of the following functional components: a power source, a switch hook, a dialer, a ringer, a transmitter… See more