Nipkow disk

A Nipkow disk (sometimes Anglicized as Nipkov disk; patented in 1884), also known as scanning disk, is a mechanical, rotating, geometrically operating image scanning device, patented in 1885 by Paul Gottlieb Nipkow.[1] This scanning disk was a fundamental component in mechanical television, and thus the first televisions, through the 1920s and 1930s.[2]

Schematic showing the circular paths traced by the holes in a Nipkow disk

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