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Precious metals are a key component of virtually all telephone systems, from the mouthpiece to the relay contacts that deliver signals from one phone to another.
Typically, only minute quantities of precious metals are needed for the manufacture of telephones, although precious metals, particularly gold, are used to a larger... more »
The history of the copy machine is a long one, with a variety of changes that occurred over the years. While some copiers use ink, the majority of office machines utilize a process in which dry toner is fused to paper using heat. Many people refer to copy machines as Xerox devices due to the fact that the company was the first to... more »
With the rapid increase in the availability of high-speed Internet service, many households are converting from dial up service to Digital Subscriber Line (DSL) technology, which provides high speed access. Your DSL service company should provide you with the necessary modem and cable equipment to set up your computer with DSL. more »
Bluetooth is one of the most widely used wireless communications protocols in the world. It is used to transfer information between wireless devices in order to sync laptops and PDAs, as well as to connect cellular phones to wireless headsets. Bluetooth is also used as a way to connect wireless networks, since bluetooth devices can... more »
Telephones combine electricity and acoustics. Acoustics is a fancy word for sound--any kind of sound, including your voice. more »
Two-way radios used to be uses mainly by people in industries such as trucking, construction,...
You may wonder what people did to communicate with each other before Alexander Bell (and a...
One of the most popular methods of communication is the telephone. Using a phone, you can make real-time contact almost anywhere in the world. And... more »
Digital telephones convert your voice into a digital signal that travels over the Internet or a private network before being converted back into a... more »
The hook switch is the part of the telephone that typically rests beneath the handset. As soon as the handset is lifted, the hook switch is... more »
Telephones, communication devices capable of transmitting speech and non-speech sounds over large distances, became a reality in the mid-19th... more »
Broadband telephones utilize voice-over-IP (VoIP) technology to send voice data through a broadband Internet connection. Such phones offer several... more »
The telephone (from the , tēle, "far" and φωνή, phōnē, "voice") is a telecommunications device that transmits and receives sound, most commonly the human voice. It is one of the most common household appliances in the developed world, and has long been considered indispensable to business, industry and government. The word "telephone" has been adapted to many languages and is widely recognized around the world.
The device operates principally by converting sound waves into electrical signals, and electrical signals into sound waves. Such signals when conveyed through telephone networks — and often converted to electronic and/or optical signals — enable nearly every telephone user to communicate with nearly every other worldwide. Graphic symbols used to designate telephone service or phone-related information in print, signage, and other media include (U+2121), (U+260E), (U+260F), and (U+2706).
History
Credit for the invention of the electric telephone is frequently disputed, and new controversies over the issue have arisen from time-to-time. As with other great inventions such as radio, television, light bulb, and computer, there were several inventors who did pioneering experimental work on voice transmission over a wire and improved on each others ideas. Innocenzo Manzetti, Antonio Meucci, Johann Philipp Reis, Elisha Gray, Alexander Graham Bell, and Thomas Edison, among others, have all been credited with pioneering work on the telephone. An undisputed fact is that 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."Brown"> That first patent by Bell was the master patent of the telephone, from which all other patents for electric telephone devices and features flowed.
The early history of the telephone became and still remains a confusing morass of claims and counterclaims, which were not clarified by the huge mass of read more at » http://en.wikipedia.org/wiki/Telephone
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