Sound motion pictures : from the laboratory to their presentation (1929)

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54 SOUND MOTION PICTURES types of equipment. They are for theatres with 750, 1,500, 3,000, and 6,000 seating capacity. The information I have given in this section relates to Type A. The equipment for Types B, C, and D machines is as follows: Type B Photophone 1. Two combination picture and sound projectors complete, less lens and projection lamps. 2. One amplifier complete with switching panel. 3. Two storage batteries, Exide, type 3-XCR-19 4. One four-unit motor-generator set. 5. One motor-starting switch (remote control). 6. One generator fuse panel complete. 7. Twelve loudspeakers complete — six with 450 mounting, six with 1 50 mounting. 8. One monitoring loudspeaker of electro-dynamic type. 9. One visual signalling system with lamps. 10. Radiotrons as follows: (a) Two UX-210; (b) one UX841; (c) eight UV-845. 11. Two photo-electric cells, type PJ-15; four photocell lamps (prefocussed). 12. Instruction book. Type C Photophone Two combination picture and sound projectors complete, less lens and projection lamps. Input control panel with visual signalling system, including lamps and fader extension. Amplifier rack, including (a) voltage amplifier control panel; (b) power amplifier control panel; (c) two voltage amplifiers; (d) two power amplifiers; (e) two battery shelves. Batteries as follows: Six heavy duty 45-volt B batteries; five general duty 45-volt B batteries; four 4^