Iconoscope

noun

1. An electron tube used in the earliest video cameras to capture images by scanning a photoactive mosaic with an electron beam.
2. A device attached to a camera, which shows in reduced scale an image of an object to be photographed; a finder. It permits a choice of point of view and arrangement.
3. an early television camera having a mosaic of photoactive cells
4. the first practical television-camera for picture pickup; invented in 1923 by Vladimir Kosma Zworykin