Telephone dating services numbers
The tall profile of AT&T's desk set, such as the 1897 model shown here, led many people to call them “candlestick” phones.When the telephone is “on hook,” contact with the local loop is broken.In early telephones the receiver was hung on a hook that operated the switch by opening and closing a metal contact.This system is still common, though the hook has been replaced by a cradle to hold the combined handset, enclosing both receiver and transmitter.
Nineteenth-century telephones typically contained a transmitter that had to be in an upright position for proper operation, with the receiver located in an attachment that rested on a hook when not in use.
Within 20 years of the 1876 Bell patent, the telephone instrument, as modified by Thomas Watson, Emil Berliner, Thomas Edison, and others, acquired a functional design that has not changed fundamentally in more than a century.
Since the invention of the transistor in 1947, metal wiring and other heavy hardware have been replaced by lightweight and compact microcircuitry.
That design is described in this section, as is the remarkable history of the telephone’s development, from the earliest experimental devices to the modern digital instrument.
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, a receiver, and an anti-sidetone circuit. In the first experimental telephones the electric current that powered the telephone circuit was generated at the transmitter, by means of an electromagnet activated by the speaker’s voice.