1) Electronic scanning device 2) Russian invention 3) Television pickup tube 4) Television-camera tube 
The Iconoscope (from the Greek: εἰκών `image` and σκοπεῖν `to look, to see`) was the first practical video camera tube to be used in early television cameras. The iconoscope produced a much stronger signal than earlier electromechanical designs, and could be used under any well-lit conditions. This was the first fully electronic ...
old kind of television camera tube
(from the article `television`) The first electronic camera tubes were invented in the United States by Vladimir K. Zworykin (the Iconoscope) in 1924 and by Philo T. Farnsworth (the ... ...television system provided the impetus for the development of modern television as an entertainment and education medium. Although ultimately ... ...
a high-velocity photoemissive camera tube in which the beam scans a mosaic capable of storing an electric charge pattern
An iconoscope is a type of television camera in which an image of the scene to be televised is projected on a mosaic consisting of granules of photo-emissive material. Emission of photo- electrons from each granule in proportion to the amount of light falling upon it results in the formation of a charge image on the mosaic.
[n] - the first practical television-camera for picture pickup
iconoscope An early form of television or video camera tube in which an image is converted into electrical impulses or electric waves.
noun the first practical television-camera for picture pickup; invented in 1923 by Vladimir Kosma Zworykin
a television camera tube in which a beam of high-velocity electrons scans a photoemissive mosaic. Cf. orthicon.