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THE PROJECTOR 207
Sprocket Idlers, page 237
104. What function do sprocket idlers perforin? What two different elements are used to hold the film to the sprocket ?
105. At what distance should idlers be spaced away from the face of the sprocket? /
106. How are sprocket idlers spaced the correct distance from the face of the sprocket? 3.S
107. What may happen if the sprocket idler is too near or too far from the face of the sprocket?
108. Must the ends of sprocket idlers be equi-distant from the face of sprocket? What happens if the distance is unequal?
109. What may happen if the sprocket idler rollers are not properly lubricated? How often should they be inspected?
Upper Magazine Tension, page 238
110. Why should tension be applied to the reel in the upper magazine of a projector? How should it be applied?
Lower Magazine or Take-Up Tension, page 238
. y • i
111. Why must slippage be provided for the lower reel ?
112. How much tension should be applied to the slippage device.''
113. Will too much take-up tension damage the film? Will it cause excessive wear of the lower (hold-back) sprocket? tv, i
Magazine Rollers and Fire Trap, page 239
114. How often and for what purpose should the magazine rollers and the fire trap be inspected?
115. Should the magazine fire trap rollers be lubricated?
The Path of Film Through the Projector Mechanism,
page 239
116. How often should the path of the film through the projector mechanism be inspected especially when old films are used?
117. How often should the path be inspected when using new films?