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206 RICHARDSON'S BLUEBOOK OF PROJECTION
87. Is it important that front shutters be located at the point of aerial image?
88. What effect does the blade produce at the point of aerial image ?
89. Is there any advantage to be gained in locating the shutter at the point of aerial image unless the width of the shutter master blade is reduced ? , " ^ "
90. Describe a practical method of testing the width of master blade, ^t-^c-^^^
91. If the width of the master blade is reduced is it necessary to reduce the width of the cut-off blade ? faK^o-;
The Rear Shutter Blades, page 233
92. In what two problems of the rear shutter is the projectionist most concerned? \ .>4i+^4i^.it^t*\Sj
93. In testing the width of the shutter blade what should be used ? ->5l£
94. How far do local conditions control the adjustment of the rear shutter blade ? •^^^ouA
95. How may beam depth at shutter position be ascertained ?
96. What is meant by the "effective beam"? you lay out the effective be;
The Gear Train, page 235
— 97. How would you lay out the effective beam on paper ? f-Q
98. What functions does the gear train perform?
99. How much lost motion is permissible in a gear train ? r
100. What maximum amount of wear is permitted in the gear train? "e,
101. How may lost motion in a gear train be measured?
Gear Lubrication, page 236
102. What is the best lubricant for projector gears? '
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Lubrication of Bearings, page 237
103. How much oil is necessary to adequately lubricate any projector bearing?