International projectionist (Jan-Dec 1946)

Record Details:

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ment of the intermittent claw make? possible this extremely light gate tension. Fig. 3 shows the entire film path with threading completed and the end of the film about to be fastened in the lower reel. Scanning of the sound track occurs at that part of the film path which is out of sight behind the flywheel in Fig. 3. The lens tube is vertical, with the exciting lamp below it, both lamp and lens being below the sound drum containing the p. e. cell. The sound drum is part of the flywheel assembly and is driven by the film. The projection lens is focused by being pushed in or out. and for fine adjustment by being rotated, within the lens barrel. Rewinding' and Reversing A view of the driving side, with film not threaded but being rewound, is shown in Fig. 4. To rewind, the beltshifter (labelled 1 in Fig. 4) is rotated to its maximum counter-clockwise position. The reversing switch (the lower of the pair shown just behind the tilt knob in Fig. 1 ) is thrown to "reverse." The motor switch (between the two right-hand knobs on the sloping panel of Fig. 1) is then thrown to "start." Rewinding may be accelerated by pushing button 2 (Fig. 4), just as the right-hand thumb is there shown. Thus there is eliminated the need to remove reels or belts, plus changing them around, in order to rewind. To reverse the film while still threaded, the pressure roller (directly under the left-hand thumb in Fig. 2 ) is moved to the rear position and the reversing switch is thrown to "reverse." The control labelled 3 in Fig. 4 is the shutter adjusting knob; and, of course, 4 in the same figure is the upper reel. The clutch knob may be seen in Fig. 1 above the left of the flywheel. To project a single frame this knob is rotated to its maximum clockwise position, and, if necessary, the projection lens is refocussed to sharpen the image. The film may then be advanced one frame at a time by rotating the shutter adjusting knob (No. 3 in Fig. 4). Operational Details After removal from the case, the projector may be set up on the lower part of the case to give it additional height above any table that may be used. The upper portion of the projector case carries lubricating oil, spare exciter lamp, a box of fuses, spare take-up belt, lamp glove for removing projection lamp, a small cleaning brush and spare lenses. The reel arms remain part of the projector at all times: they are merely unfolded into operating position. The spring belts rotate into the pulleys automatically. Reels and cables are carried in the speaker case. The speaker is plugged into the projector assembly, after which the power supply is plugged in. This order of procedure eliminates any chance that the amplifier may possibly be switched on with no load across its output. The clutch knob (Fig. 1) is rotated to its maximum counter-clockwise position ; then the motor and lamp switches are turned on. The lamp will not light if the motor switch is off, hence it can never light unless it is receiving the benefit of the cooling blower. The light image is then centered on the screen by means of the tilt knob, FIGURE 4 and L lifting the projector horizontally or by moving it toward or away from the screen, and then focussed. The volume control is adjusted as necessary till photocell hiss is heard, at which time the volume control should be at or very near maximum volume position. // not, a screiv-driver or even a finger nail is used to adjust p. e. cell voltage. The adjusting screw for this is at the rear of the mechanism, on the same panel with the cable jacks and the fuse (not shown in these pictures). For sound-film operation with 110volts d. c. a converter must be used, although none is needed for silent operation. Constructional Details The projection lamp may be either the 750 or 1,000-watt type; it is vertically and laterally adjustable, as noted, without opening the casing. Film reels may be up to 2,000 feet capacity. The FIGURE 2 FIGURE 3 INTERNATIONAL PROJECTIONIST