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[4] It is the first public demonstration of an all-electronic television system. 11: The first broadcast of a play by television, melodrama The Queen's Messenger, on General Electric's W2XAD from Schenectady, New York, utilising techniques created by Ernst Alexanderson. Three electromechanical cameras are used. [5]
Mechanical television or mechanical scan television is an obsolete television system that relies on a mechanical scanning device, such as a rotating disk with holes in it or a rotating mirror drum, to scan the scene and generate the video signal, and a similar mechanical device at the receiver to display the picture.
This is widely regarded as the first electronic television demonstration. Many inventors had built electromechanical television systems before Farnsworth's seminal contribution, but Farnsworth designed and built the world's first working all-electronic television system, employing electronic scanning in both the pickup and display devices. [7] [8]
A number of experimental and broadcast pre World War II television systems were tested. The first ones were mechanical based (mechanical television) and of very low resolution, sometimes with no sound. Later TV systems were electronic (electronic television). For a list of mechanical system tests and development, see mechanical television.
The device was first described in a patent application he filed in Hungary in March 1926 for a television system he dubbed "Radioskop". [17] After further refinements included in a 1928 patent application, [ 16 ] Tihanyi's patent was declared void in Great Britain in 1930, [ 18 ] and so he applied for patents in the United States.
[11] [12] By September 3, 1928, Farnsworth had developed the system sufficiently to hold a demonstration for the press, [12] the first such successful demonstration of a fully electronic television system. [12] In 1929 Farnsworth eliminated a motor generator from the system, so it then had no mechanical parts.
This is a list of pre-World War II television stations of the 1920s and 1930s. Most of these experimental stations were located in Europe (notably in the United Kingdom , France , Germany , Italy , Poland , the Netherlands , and Russia ), Australia , Canada , and the United States .
John Logie Baird's Television Development Company demonstrates their model A, B, and C 'televisors' to the general public at the Radio Exhibition held at Olympia in London. The exhibition proves hugely popular, with an estimated nine hundred people per day watching the demonstration programming.