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MOVIETONE BULLETIN
_ Published in the interest of the Movietone Projectionist oe
Fox CASE CORPORATION 460 WEST 54™ ST., NEW YORK
VOLUME I, No. 37
SEPT. 15, 1928
W's threading the projector movietone projectionists must be sure the lower loop—the loop
immediately below the _ intermittent sprocket —and the sound loop — the one immediately above the sound gate — are both of correct size. Failure in this matter will throw the sound out of synchronism with the motion.
The _ illustration shows them of correct size. To form them correctly, turn the mechanism fly wheel in the direction it normally runs until the intermittent sprocket is just ready to move. In this position the Simplex rotating shutter master blade will be below’ the light beam and just ready to start cutting through it. You may set the mechanism quickly by noting the position of the shutter, placing a wee bit of
white paint on its rim opposite the master blade cutting edge, so that it may be instantly identified.
Size
Zatch Those Loop
| -— Correct Loops Shown in Threaded Projector — |
With the mechanism set thus, allow just sufficient slack for the lower loop, (intermittent sprocket loop),
so that the finger shoved straight through resting against the edge of the lower guard when it is in position, barely will touch against the lower loop. The lower guard is shown turned down in the illustration.
To form the sound loop correctly, pull the film down through the sound gate tight and then pull it back two sprocket holes. The loop will then be of correct size and the sound and motion will be exactly in synchronization.
In movietone film the sound record is 14% inches ahead, (on the take-up side), of the film frame it accompanies. With the loops set as directed, the sound record in position for projec
tion will be exactly that distance from the center of the projector aperture, as measured along the film.