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i4o SOUND MOTION PICTURES
comprising the iooi-A base. It consists of a cast-iron bed plate supported on four adjustable legs. Mounted upon it are a film reel housing, a start and stop mechanism for the motor, including a switch connected by armoured cable with a fuse box on the edge of the bed plate, and a tilting rod and screw device for adjusting the angle of projection. A grounding lug is also mounted on the edge of the bed plate. Four foot sockets are furnished with this base as loose parts. The legs have ball ends threaded on them, so that very accurate levelling is possible by screwing the ball ends in or out. The starting and stopping mechanism includes a brake which permits rapid stopping of the machine in case of an emergency, such as film break. It is not to be used otherwise, since excessive wear and strain result if it is employed habitually.
There is a sliding connection between the rear of the 703-A bracket and the tilting rod of the i-A base. The connection is clamped by means of two machine bolts in a piece called the tilting stud. It is intended for making rough adjustments. The tilting rod is threaded at its lower end, where it passes through a nut that can be turned by means of a hand wheel mounted on the bed plate. This provides for accurate adjustment of the projection angle. To meet the needs of houses having two screens, back and front, where the projection angle has to be changed rapidly to suit whichever screen is in use, stop nuts are provided on the threaded part of the tilting rod. Once the stop nuts are locked at the proper points, either projection angle can be obtained by simply turning the hand wheel until its movement is stopped by the upper or lower nut, as the case may be. Projection angles from o° to 400 may be obtained while keeping the base level. There is a clamping screw operating on a quadrant on the i-A base. It is needed to steady the upper part of the machine and take up play.