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THE PROJECTOR 203
67. Is the speed of the intermittent sprocket unvarying from time of starting to time of stopping ? , . >
38. By what process are intermittent parts finished? *;'
39. What parts of modern intermittent movements are hardened ? Why are intermittent sprockets no longer hardened ?
40. How is any inaccuracy in the intermittent movement Th"aT effects the intermittent sprocket magnified on the screen?
Intermittent Movement Lubrication, page 217
41. What is required to keep the intermittent movement properly lubricated ?
42. How is the time for draining oil wells determined :
Intermittent Sprocket, page 218
43. What is the accepted speed of intermittent action? -^<*v<**j
44. How fast is film fed down to and taken away from the intermittent sprocket? ^3 /f'*4** <******?*
45. How is the intermittent action of the film made possible?
46. Describe the action of the upper and lower loops and the
film as a whole.
47. How often and in what manner should the intermittent sprocket teeth be examined?
Lost Motion in Intermittent Sprocket, page 220
48. How closely must cam A be adjusted to star B ?
49. What is the test for correct adjustment between star and cam?
Replacement of Intermittent Sprocket, page 220
50. What happens if the sprocket is too tight or too loose upon its shaft?
51. How does the projectionist proceed to install an intermittent sprocket ? yfl^.
52. Describe the correct procedure in installing a new sprocket on a shaft.
53. How can a V block be made ?