F. H. Richardson's bluebook of projection (1942)

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POWER SUPPLY FOR SOUND SYSTEMS Practical Questions (For answer to each question see col-responding number in text of Chapter XIX) Varieties of Power Needed, page 449 1. List roughly the varieties of electrical power needed to operate an average sound system. 2. Is a loud-speaker field ever operated by a.c. Methods of Providing Power, page 450 3. Are dry cells ever used to supply voltage for sound? 4. Why cannot power line d.c. be used to supply 90-volt d.c. to a photo-electric cell? 5. For what sound purpose can line d.c. be used, and how? 6. What auxiliary apparatus is used with a motor-generator supplying sound power ? How to Read Electrical Drawings, page 451 7. What is the most convenient way to study a sound circuit? 8. What is a schematic drawing? 9. What is the difference between a schematic drawing and a wiring drawing? Rectifiers, page 454 10. What device is almost universally used to supply current and voltage in modern sound equipment? 1 1. Describe in outline a complete rectifier circuit supplying lowvoltage d.c. from an a.c. source. The Care of Tube Rectifiers, page 455 447