[Rob]

The color system that was championed by CBS in the early 50's and that is still used in some industrial and scientific applications because it can use a single B&W camera and phase distortion in the broadcast link does not distort the color reproduction (NASA uses this type of camera on its spacecraft probes) was employed by Eidophor to produce color in its single light-valve projectors. I have several of their 1970's vintage model 5181 that came out of a ship's wheelhouse simulator at the Merchant Marine Academy, Long Island, NY. These projectors use a rotating dichroic filter wheel in the intense light path from the xenon arc lamp on its way to the light valve. Solid state electronics regulate the speed and phase of this wheel and also control video gain and pedestal for each color field. I have had one of my projectors working in the 441 line / 180 field video format on the special color bar and test pattern generator which I acquired with the lot purchase of these machines.