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204 RICHARDSON'S BLUEBOOK OF PROJECTION
Aperture Plate Tension, page 222
54. 55. 56.
57.
58.
59.
60.
61.
62.
What is the effect of insufficient tension at the aperture?
What is the effect of too much tension at the aperture ?
What tension at the aperture imposes the least strain upork^_
both the film and projector mechanism?
Describe a practical method of adjusting tension at the
aperture without resorting to special tools.
How do you determine whether or not the tension shoes
on each side are exerting the same pressure ?
Why does good definition require that the surfaces of the
tension shoes and the aperture plate tracks be perfectly level
and flat?
Will worn tension shoes and aperture plate tracks buckle
the film as it lies over the aperture?
How often should tension shoes or aperture plate tracks be
tested for flatness ? »^u^v^w g'o^A
What must be guarded against in installing new aperture
plate tracks (or a plate and tracks in one unit) ?
The Rotating Shutter, page 225
63. What is "persistence of vision"?
64. What is the only thing that is visible to the eye on a motion picture screen?
65. What would happen were a picture projected without the rotating shutter?
66. Does the shutter master blade cut all light from the screen when the film is moving over the aperture?
67. Why has the rotating shutter more than one blade ?
68. Explain the illusion of continuity of motion.
; /■■ *
Setting the Shutter, page 226
69. Describe the process of setting a shutter.
Rotating Shutter and Intermittent Speed, page 227
70. What is the relation between the speed of the intermittent movement and the width of the rotating shutter master blade ?
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