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SCREENS
1. What are the itcm^ of basie importance in a screen?
K Reflecting Surfaces, Etc., page 1 \6
2. What docs wasted light represent?
3. What two chief items arc involved in consideration of reflection power ?
4. Is the amount of light reflected in one direction necessarily any indication of the amount reflected in other directions
5. What affects reflection power?
6. Do all pure white surfaces have equal reflection power?
7. Why is loosely woven white cloth a poor reflection surf.
8. How may fine, hard-twist white cloth be made a good reflection surface ?
9. Is white lead paint a good reflection surface and how may its reflection power be improved ?
10. Is kalsomine a good reflection surface?
1 1. What are the chief objections to metallic screen surfacesj
12. Name the chief points for and against glass bead screens.
13. Can a glass bead screen be cleaned to restore its reflection powers in full ?
14. For what condition i> the glass bead screen or other specular surface best suited ; for what conditions are ill suited?
15. Is reflection power of all screens reduced at each cleaning?
16. Upon what points should exhibitors and projectionsist concentrate when purchasing a new screen?
17. Is the percentage of reflected light a varying clement ? What causes variation?
18. What causes variation?
Testing Inflection Power, page 14*>
19. How may loss in reflection power due to age or accumulation of dirt be tested in a thoroughly practical manner?
20. Are statements that a screen will reflect light in excess of 150 percent correct ?
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