Iconoscope

The Iconoscope (from the Greek: εἰκών "image" and σκοπεῖν "to look, to see") was the name given to an early television camera tube in which a beam of high-velocity electrons scans a mosaic of photoemissive isolated granules. Some of the principles of this apparatus were described when Vladimir Zworykin filed two patents for a Television system in 1923 and 1925.