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202 RICHARDSON'S BLUEBOOK OF PROJECTION
19. What precautions are necessary in handling dowsers in high intensity light sources?
Inspection, page 212
20. How often should condensers be inspected and cleaned ? *
21. How often should the interior of lamphouses be inspected and thoroughly cleaned ?
22. What happens when the wires inside the lamphouse become over-heated ?
23. How are wires inside the lamphouse tested for satisfactory condition ?
24. Does discoloration of the copper under insulation condemn a wire?
25. Why and how often should wire connections inside the lamphouse be taken apart and cleaned?
Lamphouse Support and Alignment, page 213
26. How much forward and backward movement should the lamphouse supporting rods supply?
27. Should provision be made for side movement of lamp-, house ?
28. Must the condenser or mirror have means for adjustment upward, downward and sidewise ?
The Intermittent Movement, page 214
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29. How is the rotating shutter and intermittent movement locked together to work in exact synchronism ?
30. What is accomplished by each cycle of action of the intermittent movement?
31. At 90 feet per minute projection speed how often is the projector aperture covered with a film photograph?
32. How accurate must the action of an intermittent movement be?
33. How closely are intermittent parts fitted together?
34. What parts make up the standard intermittent movement?
35. Explain the action of an intermittent movement.
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36. What is meant by an intermittent movement being '-'on the lock"?