The invention of the television was the work of many individuals in the late 19th century and early 20th century. Individuals and corporations competed in various parts of the world to deliver a device that superseded previous technology. Facsimile option market making baird pdf systems pioneered methods of mechanically scanning graphics in the early 19th century.
The Scottish inventor Alexander Bain introduced the facsimile machine between 1843 and 1846. Willoughby Smith, an English electrical engineer, discovered the photoconductivity of the element selenium in 1873. This schematic shows the circular paths traced by the holes, which may also be square for greater precision. The area of the disk outlined in black shows the region scanned.
As a 23-year-old German university student, Paul Julius Gottlieb Nipkow proposed and patented the Nipkow disk in 1884. This was a spinning disk with a spiral pattern of holes in it, so each hole scanned a line of the image. The first demonstration of the instantaneous transmission of images was by Georges Rignoux and A. A matrix of 64 selenium cells, individually wired to a mechanical commutator, served as an electronic retina.
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