F. H. Richardson's bluebook of projection (1935)

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DRIVES i. What two different classes of mechanism are needed to move the sound film or the disc turntable? Drive Motors, page 599 ^^uJ^^M^ 1. What is required of a dr;rve motor? 3. What are "wows" ? What is "flutter" ? 4. What is the most common type of drive motor ? 5. Why is it successful? 6. Is a synchronous motor used to drive a non-synchronous turn-table ? 7. Are synchronous motors used in theatres where only d.c. is available? *>%•* Motor Speed Controls, page 601 8. Name four methods of controlling motor speed. — 9. What is centrifugal speed control as used with d.c. motor? Explain how it works. 10. How does motor speed affect the centrifugal contacts ? 11. What are "motor control cabinets"? '.jlZcU, •0"^ ■ 12. Explain the action of a motor control cabinet that has tubes. — 13. Explain the action of a motor control cabinet using vacuum tubes. ... 14. What is "hunting" in a motor? Drive Transmissions, pack hi 7 \?. What is the drive transmission? 16. What is required of the drive transmission? 17. What is a "damping device"? "-^>itru 597