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November, 1950
ROSS : NEW STILL PROCESS PROJECTOR
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By removing the aperture mask the total light output is nearly 90,000 lumens, but being an approximately circular patch of light, it is not of much value for process work.
It is believed that this equipment gives greater light output than other single-unit projectors,4 particularly with regard to the brightness of the edges and corners of the picture.
Slide Holder.
The optical system is designed to fill a gate aperture 3 x 2.2 ins. This is the largest area of the standard 4 : 3 proportions which can be used on the usual British slide 3 J x 3J ins., and, further, any larger size might require an inordinately large diameter for the No. 4 aspheric condenser lens.
The slide holder is designed to carry 5x4 ins. slides, and vertical, horizontal and tilting movements are provided so that a certain degree of animation may be introduced into the background, e.g., for moving clouds, treadmill shots or
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Fig. 5. Operating the Projector by Remote Control.
various trick effects. The total horizontal movement is 3.5 ins., the vertical 2.5 ins., and 30° of rotation. These movements may be made at the projector or by remote control from a desk at the camera position ; the mechanism is silent and may be operated during shooting. M-motors are used, working off D.C. to avoid hum. These motors rotate through discrete amounts, or " steps," and the gear-ratios between the motors and slide movements have been chosen so that it is not possible to see on the screen any jerkiness of motion. The two controls at the desk, shown in Fig. 5, can be drawn out on extension cables ; these can be switched at the projector on to the slide movements or the objective lens adjustments. A talk-back is fitted which gives good speechtone and has ample sensitivity.
For shots where no movement is required, an adaptor may be used for carrying 3J x 3J ins. slides in the holder.