Telephone

phonetelephonesLocal Telephone Servicefixed telephonyphonestelephonyFixed-Line TelephonyTelephone numbertelephone receiverfixed
A telephone, or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly.wikipedia
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Galvanic corrosion

electrolytic corrosiongalvanicgalvanic attack
The line voltages are negative compared to earth, to reduce galvanic corrosion.

Calling party

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A calling party wishing to speak to another party will pick up the telephone's handset, thereby operating a lever which closes the switchhook (A4), which powers the telephone by connecting the transmitter (microphone), receiver (speaker), and related audio components to the line.

Ohm

Ωohms
The off-hook circuitry has a low resistance (less than 300 ohms) which causes a direct current (DC), which comes down the line (C) from the telephone exchange.

Dial tone

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The exchange detects this current, attaches a digit receiver circuit to the line, and sends a dial tone to indicate readiness.

Called party

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On a modern push-button telephone, the caller then presses the number keys to send the telephone number of the called party.

Busy signal

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If the called party's line is in use, the exchange returns a busy signal to the calling party.

Call waiting

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However, if the called party's line is in use but has call waiting installed, the exchange sends an intermittent audible tone to the called party to indicate an incoming call.

Capacitor

capacitorscapacitivecondenser
The ringer of a telephone (A7) is connected to the line through a capacitor (A6), which blocks direct current but passes the alternating current of the ringing signal.

Digital Multiplex System

DMSDigital Multiplex System (DMS)digital technology
In modern telephone networks, fiber-optic cable and digital technology are often employed in such connections.

Frequency

frequenciesperiodperiodic
Powered by the line, the microphone (A2) produces a modulated electric current which varies its frequency and amplitude in response to the sound waves arriving at its diaphragm.

Amplitude

peak-to-peakintensityvolume
Powered by the line, the microphone (A2) produces a modulated electric current which varies its frequency and amplitude in response to the sound waves arriving at its diaphragm.

Diaphragm (acoustics)

diaphragmmembranespeaker cone
Powered by the line, the microphone (A2) produces a modulated electric current which varies its frequency and amplitude in response to the sound waves arriving at its diaphragm.

Voice coil

Voice Coil motorvoice-coilcoil
The resulting current is transmitted along the telephone line to the local exchange then on to the other phone (via the local exchange or via a larger network), where it passes through the coil of the receiver (A3).

Royal Navy (disambiguation)

Royal NavyRNBritish
The slang came from the Royal Naval ships prior to telephones.

Air horn

airhorncompressed air horngoal horn
This instrument used four air horns to communicate with vessels in foggy weather.

Invention

inventorinventionsinventors
As with other influential inventions such as radio, television, the light bulb, and the computer, several inventors pioneered experimental work on voice transmission over a wire and improved on each other's ideas.

History of television

televisionelectronic televisiontelevision history
As with other influential inventions such as radio, television, the light bulb, and the computer, several inventors pioneered experimental work on voice transmission over a wire and improved on each other's ideas.

Incandescent light bulb

incandescent lampfilamentincandescent
As with other influential inventions such as radio, television, the light bulb, and the computer, several inventors pioneered experimental work on voice transmission over a wire and improved on each other's ideas.

History of computing hardware

history of computerscomputer historyearly computers
As with other influential inventions such as radio, television, the light bulb, and the computer, several inventors pioneered experimental work on voice transmission over a wire and improved on each other's ideas.

Antonio Meucci

MeucciHRes 269
Charles Bourseul, Antonio Meucci, Johann Philipp Reis, Alexander Graham Bell, and Elisha Gray, amongst others, have all been credited with the invention of the telephone. 28 December 1871: Antonio Meucci files patent caveat No. 3335 in the U.S. Patent Office titled "Sound Telegraph", describing communication of voice between two people by wire. A 'patent caveat' was not an invention patent award, but only an unverified notice filed by an individual that he or she intends to file a regular patent application in the future.

Elisha Gray

GrayGray, Elisha
Charles Bourseul, Antonio Meucci, Johann Philipp Reis, Alexander Graham Bell, and Elisha Gray, amongst others, have all been credited with the invention of the telephone.

United States Patent and Trademark Office

U.S. Patent OfficeU.S. Patent and Trademark OfficeUSPTO
Alexander Graham Bell was the first to be awarded a patent for the electric telephone by the United States Patent and Trademark Office (USPTO) in March 1876.

L'Illustration

Illustrationl'''Illustration
26 August 1854: Charles Bourseul published an article in the magazine L'Illustration (Paris): "Transmission électrique de la parole" (electric transmission of speech), describing a "make-and-break" type telephone transmitter later created by Johann Reis.

Patent

patentspatent lawpatented
28 December 1871: Antonio Meucci files patent caveat No. 3335 in the U.S. Patent Office titled "Sound Telegraph", describing communication of voice between two people by wire. A 'patent caveat' was not an invention patent award, but only an unverified notice filed by an individual that he or she intends to file a regular patent application in the future.

Water microphone

water transmitterliquid transmitterliquid transmitters
Some used a water microphone, some had a metal diaphragm that induced current in an electromagnet wound around a permanent magnet, and some were dynamic – their diaphragm vibrated a coil of wire in the field of a permanent magnet or the coil vibrated the diaphragm.