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MANAGERS AND PROJECTIONISTS 947
flood lamp. The swing, or sidewisc motion, is carried by ball bearings, and the counterbalance such that the up and down movement is accomplished with but a slight effort, the head remaining in any position in which it may be left.
Two five-inch-diameter iris shutters are mounted directly in front of each condenser. These are controlled by suitable levers, conveniently located. They are for the purpose of regulating the size of spot or flood on stage or orchestra pit.
Figure 371
Immediately in front of the iris shutters are framing shutters such as are shown in Fig. 371. By means of these and their possible adjustments, the projectionist may project either a horizontal or a vertical light beam, of any desired width or height, or he may project a perfectly square beam if he so desires.
In grooves in front of the framing shutters an adjustable star shutter may be mounted and by its use a perfectly formed five-pointed star may be projected, of any desired size and color. The size of the star may be altered at will merely by moving a conveniently located lever.
Two projection lenses, of different focal length, are mounted on both the upper and lower unit, as per Figs. 372 and 373. They are mounted on swivel collars so that they may be quickly thrown into position in the light beam, or just as quickly removed therefrom. The lens nearest the slides is of correct focal length to project a flood of light over the entire stage, or orchestra pit, as may be desired. The lenses nearest