dimecres, 21 de maig del 2008

A great invention: the TV.

For my opinion, the television is a great invention for the humans.

Television is a widely used telecommunication medium for broadcasting and receiving live, moving greyscale or color images with sound. The word is derived from mixed Latin and Greek roots, meaning "far sight": Greek tele, far, and Latin vision, sight.

The origins of what would become today's television system can be traced back to the discovery of the photoconductivity of the element selenium by Willoughby Smith in 1873, the invention of a scanning disk by Paul GottliebNipkow in 1884, and Philo Farnsworth's Image dissector in 1927.

On March 25, 1925, Scottish inventor John Logie Baird gave a demonstration of televised silhouette images in motion at Selfridge's Department Store in London. In 1927, Baird transmitted a signal over 438 miles of telephone line between London and Glasgow. In 1928, Baird's company (Baird Television Development Company / Cinema Television) broadcast the first transatlantic television signal, between London and New York, and the first shore-to-ship transmission.