Multi-channel television

An experimental television system designed expressly to examine the conditions necessary for the transmission and reception of comparatively good pictures is described. Five picture channels are used which accommodate a frequency band sufficient to produce an image composed of 15 000 elements. The received picture is projected on to a screen measuring 24 in. by 16 in., and is scanned at the rate of 12¿ times per second. The best operating conditions for the Kerr cells of the receiver are investigated, and the effects of geometric, nonlinear, and frequency distortion are examined.