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FILM TRANSMISSION EQUIPMENT 113 a motion picture equipment company and modified according to the designs of the television manufacturer.) The upper and lower magazines, which are the round drumlike affairs above and below the mechanism, hold 2000 feet of 35 mm film which runs for twenty-two minutes. This is the maximum allowed by many local fire laws to be in any one magazine at a time. The large motor on the front drives the projector at the standard theatre speed of twenty-four frames per second. The lamphouse on this particular model will house an arclamp, but the Synchrolite unit may also be supplied. The massive base is a feature, and the general ap- pearance of solidity is in keeping with the need for steadiness in operation. The projector is not very different in appearance from those used for theatres. The glass windows in the magazines are to allow the operator to check on the condition of the reels since it is illegal in some states to open the magazines when the projector is running (for the film, it will be remembered, is highly inflam- mable). This projector is a straight television model designed lely for that purpose. The RCA 35 mm Projector Figure 4-13 shows the standard RCA television projector and Figure 4-13A the film mechanism with the film in the process of being threaded (the film in the illustration is blank leader). Those readers who are familiar with the equipment regularly employed in movie theatres will notice at once the small size of the television projection machines. This is brought about chiefly by the need for less light in the television film camera chain which immediately reduces the need for exten- sive cooling arrangements and the absence of the shutter. The illustration shows how simple threading or "lacing up" as it is sometimes called, really is. After placing the loaded reel with the emulsion side towards the lamp in the upper magazine and locking the axle lock to keep the reel in position, film is threaded through the upper magazine slot. The film pad rollers, which are the rollers with the knurled knobs seen immediately above the open film gate and just to the right of the back of the hand at the bottom, are raised from the sprocket wheels which drive the film through