First telephone презентация

A telephone is a vehicle for a transmission and reception of sound in the distance.

Alexander Graham Bell

Alexander Bell gave a request in the Washingtonian patent bureau on the invention of February, 14, 1876. This very day inventor Elisha Gray from Chicago gave a preliminary request on "Device for a transmission and reception of vocal sounds a telegraph method".
On this case there were numerous spores about that, who the first invented a telephone.

on June, 25, 1876. Alexander Bell first showed the telephone on the first World electrical engineering exhibition in Philadelphia.

In the future, we invent many different types of connections : Cell Phone , Field Telephone, Satellite Telephony, IP- phone
Along with the phone , so there were the telephone hooliganism and fraud , spam and echo.

Cell Phone - Communication anywhere
Satellite phone - transmitting information directly via a dedicated communications satellite. The scope of coverage can be either the entire Earth , or only specific regions .
Field Telephone - primarily designed for communication during combat .
IP- phone - to transmit voice , digitized and compressed using digital techniques through networks built IP-enabled . For example, over the Internet.

Before the invention of telegraphs and telephone for passing of messages on large distances ordinary methods were used, like a sing, gong, smoke signals or drumbeat. For example, a shot from a rifle is audible in the distance approximately ten kilometers

Phone - helps people communicate with each other .