THE CINEMATOGRAPH BOOK The projecting apparatus is shown in Fig. 132. It works at double ordinary speed, projecting thirty-two images per second, sixteen being projected through the green segment of the colour filter A, and the other sixteen through the red segment. The arrow H indicates the direction of the light rays from the illuminant; C is a light guard, preventing stray light from passing to the screen; D the driving pulley, F the film, E safety spool, G governor balls and B safety shutter.
A special feature in the formation of the colour filter must now be referred to. Supplementary to the green filter As (see Fig. 133) an overlapping segment of green is filled from C to D with the object of obtaining balance of colour, since red is more vivid to the eye than green. The size of this supplementary segment C D is a
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Natural Colour Kinematograph Pictures
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