Who Invented The Mechanical Television And When

John Logie Baird Invented The Mechanical Television  January 26, 1926 Mechanical television or mechanical scan television is a television system that relies on a mechanical scanning device, such as a rotating disk with holes in it or a rotating mirror, to scan the scene and generate the video signal, and a similar mechanical device at the receiver to display the picture.

Who Invented Led Bulb And When

Nick Holonyak, Jr. Invented Led Bulb Led Bulb was invented in 1962 Led Bulb is  a solid-state lighting (SSL) device that fits in standard screw-in connections but uses LEDs (light-emitting diodes) to produce light.

Who Invented Letters And When

The first Letters were invented nearly four thousand years ago (between 1800 and 1900 BC). Scholars attribute its origin to a little known Proto-Sinatic, Semitic form of writing developed in Egypt between 1800 and 1900 BC. Building on this ancient foundation, the first widely used alphabet was developed by the Phoenicians about seven hundred years […]