International projectionist (Jan-Dec 1945)

$&tlfflf$l%pr INTERNATIONAL PROJECTIONIST VOLUME XX MARCH 1945 NUMBER 3 The Operation and Maintenance of a Popular 16-mm Projector INCREASING calls upon projectionists to operate 16-mm equipment, and and the obvious growth in post-war importance of such equipment, has interested many I. A. projectionist locals throughout the country, and stirred a demand for more information on the details of such apparatus. One very large local now maintains a school in which members are instructed in 16-mm operation and maintenance. The armed services, of course, use 16-mm projection on a large scale, both for training films and for entertainment. The importance of this type of apparatus not only is increasing but plainly will continue to increase. Most 16-mm installations are of the portable variety — hence ordinary operation involves such details as proper placement of speakers and correct alignment with the screen, and to some degree assembly of the equipment, in addition to actually running the show. On the other hand, 16-mm does not have the extreme safety requirements associated with standard projection, inasmuch as the film is far less flammable. Figure 1 illustrates the outside view of the projector-soundhead lamphouse assembly of the DeVry Model RS. The amplifier and the speaker or speakers connect to Figure 1 by plugs and cords. The feed reel, shown at top, left, must be erected to the position in which it is MARCH 1945 By AAROJS 1SADELL Recent widespread and intense interest in 16-mm projection apparatus prompts publication of this article, which describes completely and in detail the operation and maintenance of one popular model of such equipment. Similar descriptions, covering other makes and models, will appear from time to time in subsequent issues. seen in the illustration. Both reels detach from their reel arms, and the arms themselves fold back into the carrying case when the equipment is to be transported. Lamp House Cover In Figure 2 we see the lamphouse cover (invisible inside Figure 1) in process of being removed. The condenser is shown at A. There are two screws, B and B, which must be removed to oil the motor— the plate in which they are seated then can be slipped aside, and the motor oil-holes become accessible. The knob, M, permits turning the mechanism by hand. The operating side of the projector is shown in Figure 3. The reel arms in this picture are folded in place for carrying. Pressing buttons B and B, permits these arms to be rotated out of the carrying case for operation. In Figure 1, in which the projector is seen from the driving side rear, the upper feed arm is operating position, and the reel attached. Returning to Figure 3, A, at right bottom, is the knob that locks the tilting device in that corner; the device itself consisting of the rod just above and left of A, which rod can be lowered and held in place by locking A, in order to provide projection angle as needed. C in Figure 3 is the threading lamp, and E is the focusing knob. Additional details of the operating side of this projection mechanism will be found in Figure 4. Here both reels are shown in operating position — both reel arms extended. At lower right, A is the same tilting lock nut previously noted. B, top right, is an idler ; C a guide roUer. R is an oil-hole at the upper sprocket. Knob D, center left, is pressed to open the gate. M, center left, a little lower down, is the PEC housing. G a bit to right of M, is the "lower" sprocket roller. N and N are two nuts, easily removed, which hold the exciter lamp housing in place. K is a nut which can be shifted to right or left to substitute a second exciter if the one in use burns out. Some of these matters will be covered in further detail in connection with later illustrations.