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HANDBOOK OF PROJECTION FOR
Slow Burning
Of what does "Slow-burning Weather-proof Insulation" consist? 82
May fire-proof insulation be used in the open — out of doors ? 82
What is the difference between "Slow-burning Weather-proof ' and "Weather-proof* insulation?,,,, 82
Intermittent Speed, Measuring of
(See Vol. II, page 659)
Lenses
Quote the law which deals with light intensity at different distances from its source 125
How may you demonstrate the correctness of the law referred to in previous question? 161
Explain the action of this law as exemplified in Figure 27, Page 126. 126
Of what is the motion picture projector optical train composed ? 125, 126, 160
What is the first element of the optical train and what is its function ? 126, 160, 171
The second lens element of the projector optical train is the projection lens. What is its function? 126, 160, 171
Why will line F A, Figure 27, Page 125, be perpendicular to both surfaces of the lens ? 126
Light Refraction by Lens
Why would a ray of light represented by line F A, Figure 27, Page 125, not be refracted at all by the lens, and why would a minimum percentage of its light be reflected by the surface of the lens?
126, 141
Explain the refraction of the rays represented by lines F C and F G, Figure 27, Page 125.... 126
Are rays refracted by a lens except at its surface?.. 131
Upon what law is the action of lenses based? 127
Upon what factors does the amount of bending light rays will receive in entering or leaving a lens ? . . 128
Explain the action of light rays as shown in Fig. 28, Page 128 .•••:••■ 128
For all practical purposes what may the projectionist assume that the amount of bending or refraction light rays will receive in passing through a lens will depend? 129
Where may the student find explanations of why light is refracted in passing through a lens ? 129
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