Noun
English Wikipedia has an article on:Nipkow diskWikipedia
Nipkow disk (plural Nipkow disks)
A mechanical, geometrically-operating image scanning device, a fundamental component of early mechanical television.
A bright light shining through a spinning Nipkow disk set with lenses projected a bright spot of light which swept across the subject. Source: Internet
As a 23-year-old German university student, Paul Julius Gottlieb Nipkow proposed and patented the Nipkow disk in 1884. Source: Internet
The system consisted of a large Nipkow disk attached by a mechanical linkage to a conventional 78-rpm record-cutting lathe. Source: Internet
This was transmitted by AM radio waves to a receiver unit, where the video signal was applied to a neon light behind a second Nipkow disk rotating synchronized with the first. Source: Internet