a scanning device, first used in early television transmitters and receivers, consisting of a rotating drum having its curved surface covered with…

a rotating disc having a spiral of holes near the edge, used in mechanical systems of television to provide a sequential scan of a scene by optical…

Television. Any of several devices that permit the sequential transmission of an image or its subsequent reconstruction in a receiver.

Originally: a scanning disc, used in some early television transmitters and receivers, which has a line of small apertures near the…

(a) the motion of a scanning beam or spot along a line; (b) the electrical signal which causes this; (c) an apparatus or technique which scans an…

any of four coils arranged in pairs around the neck of a cathode-ray tube, the magnetic field of which is varied so as to cause the electron beam to…