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SOURCES OF SOUND CURRENT
1. From what three sources are sound currents obtained in the
projection room? •'• _^vV ,
Reproduction of Sound on Film, page 511
2. Explain the action of a "lens tube."
3. What is the purpose of the "sound gate"?. ?*
4. What does the photo-cell "see?"
5. How does the photo-cell "see" frequency?
6. What light-beam focus is necessary to reproduce 9,000 cycle
sound? Why? ///&0*
7. How does the photo-cell "see" volume?
*8. How is volume recorded on a variable density sound track?
9. How is volume recorded on a variable area sound traclT?
10. Explain noiseless recording.
11. Does the use of noiseless recording require any changes in
the projection room? ^>ur,
12. Describe the construction of a photo-electric cell.
13. What is the difference between the cathode of a photo-elec ^^J^^J^^^L /
trie cell and the cathode of a rectifying tube? . ^dt^^A******* P,c,Q
14. Describe the cathode of a photo-electric cell. 'sJJL+ww
15. Describe the anode of a photo-electric cell.
16. How and why does the photo-electric cell create sound cur
rents?
17. Are all theatre photo-cells, photo-electric cells? What is a
photo-conductive cell? CfM
18. Describe and explain two methods of photo-cell coupling.
19. What is "condenser coupling"? 'Transformer coupling'
Lake of Souxd-on-Film Equipment, page 521
20. How is the exciting light focus adjusted? /" feVtf-t
21. Describe two practical methods of testing exciting light focus \*vJj
22. What harm is caused by oil in a lens tube? / j ^/
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