International projectionist (Jan-Dec 1945)

Record Details:

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FIGURE 3 FIGURE 4 FIGURE 5 may be placed at both sides of the screen, at about middle height, or, if there is only one, at one side of the screen (either side). A single speaker may be placed either above or below the screen — pointing at the audience so far as possible — but a speaker should not be placed so low or so angled that it blares directly into the front rows of the audience. Illusion will never be as good as with 35-mm equipment properly installed, but it is surprisingly good nevertheless. Even though the sound does not originate at quite the natural source the audience forgets that after a few minutes, provided it can hear plainly and no spectators are subjected to the direct blast of the speaker. The various cables (Figure 1) must be installed by inserting their plugs in the corresponding sockets. This procedure is obvious and should give no trouble. Threading Film is shown threaded in Figures 4 and 5. Additionally, each of these projectors has a very visible, extremely clear threading diagram inside the door of the operating side. These projectors can be threaded in absolute darkness after some experience has been gained. Following the printed guide accurately will eliminate all threading trouble. The sprocket holes — there is only one row of sprocket holes in 16-mm film, not two rows as in 35-mm — must be toward the projectionist. The film must come down from the righthand side of the upper reel. There are exactly 25 frames between the projection aperture and the sound aperture. The projector is turned over by hand, as a rule, using the knob M (Figure 2 and Figure 7) to assure that threading is correct and that the shuttle claw properly engages the sprocket holes. The motor switch and light switch of Figure 1 then start the show. The "Silent-Sound" switch. Figure 1, is always left in "Sound" position, even when running silent film, unless you want to operate at non-standard speed — standard speed being 24 frames per second, as with 35-mm projection. When that switch is thrown to "Silent" position the motor speed control knob (Figure II becomes operative. Cleaning and Oiling The pressure plate can be removed: — with the gate open — by pushing it upward. It snaps out. It must, of course, be replaced in exactly its original position. Ordinarily, this plate will not have to be removed for cleaning, since it opens wide enough to allow insertion of any soft cleaning utensils — soft cloth, or a matchstick, for example. The lamphouse cover pulls off as shown in Figure 2, giving access to reflector and condenser. FIGURE 6 The door at the rear of the projector gives access to the "driving side" (rear). The oiling cup at the top of the mechanism (Figure 1) lubricates all gears. Light mineral oil is recommended. Lubrication of the motor has been discussed in connection with Figures 2 and 7. The motor should seldom be lubricated, being equipped with ball bearings. White vaseline in very small quantities may occasionally be added to the gears. An extremely slight amount of oil, as much as can be applied with a toothpick, may be added at X and Y of Figure 5 and R of Figure 4. Wipe away any trace of excess. Occasionally lubricate the oil holes at the outer ends of the reel arms, avoiding any excess of lubricant. Ordinary care and projection skill, as normally applied to 35-mm installations, should be quite adequate to caring for any routine troubles this 16-mm equipment may encounter. Remember that electrical connections are not permanently installed, therefore check all cable plugs. Remember that a loose exciting (Continued on page 12) FIGURE 7 MARCH 1945