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

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POWER SUPPLY FOR SOUND SYSTEMS Varieties of Power Needed, page 490 1. List roughly the varieties of electrical power needed to operate an average sound system. 2. Is a loud-speaker field ever operated by alternating cur rent? &tJU , ^^Wfc Methods of Providing Power, page 491 3. For what power supply purposesmay dry cells be used? 4. Why cannot power line d.c. be used to supply 90-volt d.c. to a photo-electric cell?, ; -,<f^^Y^o^-. 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 492 7. What is the most convenient way of studying any sound cir 8. What is a schematic drawing? 9. What is the difference between a schematic drawing and a wiring drawing ? ^msi Storage Battery Chargers, page 496 10. What apparatus serves as a battery charger when a battery is charged by means of a d.c. line? 11. Can a.c. be used as charging current? Why not? 12. What must be done to a.c. before it can be used to charge a storage battery? 13. Can a motor-generator be used to charge a battery ?/v/^# 488