Video Disc Photograph - Phonovision, 1920s Video Disc by Sheila Terry

Phonovision, 1920s Video Disc is a photograph by Sheila Terry which was uploaded on May 10th, 2013.

Phonovision, 1920s Video Disc

Phonovision, 1920s video disc, coloured photograph. This is a standard 78 rpm (revolutions per minute) gramophone disc, used by the Scottish engineer... more

by Sheila Terry

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Title

Phonovision, 1920s Video Disc

Artist

Sheila Terry

Medium

Photograph

Description

Phonovision, 1920s video disc, coloured photograph. This is a standard 78 rpm (revolutions per minute) gramophone disc, used by the Scottish engineer John Logie Baird (1888-1946) to record the output from his television system. The principle is the same as a gramophone, with an electromagnetic needle used instead to detect and convert the indentations on the disc back into light and sound on a television screen. Baird was granted a patent on his Phonovision system in 1928, but the image quality was poor compared to cinemas. Original photograph published in Television (Dinsdale, 1928).

Uploaded

May 10th, 2013