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In 1921 Edouard Belin sent the first image via radio waves with his belinograph.In 1911, Boris Rosing and his student Vladimir Zworykin created a system that used a mechanical mirror-drum scanner to transmit, in Zworykin's words, "very crude images" over wires to the "Braun tube" (cathode ray tube or "CRT") in the receiver.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.
An updated image was transmitted "several times" each second.
Perskyi's paper reviewed the existing electromechanical technologies, mentioning the work of Nipkow and others.
The first demonstration of the live 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.
Frederick Bakewell demonstrated a working laboratory version in 1851.
Willoughby Smith discovered the photoconductivity of the element selenium in 1873.