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MANAGERS AND PROJECTIONISTS
Installation 445
Oiling 448
Care of Commutator 451
Hertner Transverter .461 to 467
General Electric Company Motor Generator Compensates 467 to 471
Westinghouse Motor Generators 471 to 485
Hallberg Motor Generators 485 to 505
Wotton Vertical Rexolux Motor Generator ..505 to 514
Oiling the Projector
See General Instruction No. 1, page 593, and recommendations, if any, under instructions on the particular projector you are using.
Picture, Distortion of — Keystone Effect
Distortion Due to Side View and How to Calculate Amount There Will Be 252
Distortion Due to Projection Pitch — Keystone 253
How to Calculate Amount of Distortion 254
Safe Guide in Projection Pitch 255 to 256
How to Make Sides of Picture Parallel 258
How to Overcome Out-of-Focus Effect 258
Why Objects Look Abnormally Thin and Tall 253
Picture, Size of
As to Picture Size 243 to 244
Increase of Light Increase of Picture Size Makes
Necessary 245
Magnification of • Defects Increases With Size 246
Practical Projection Optics
Also see "Light Action in General, and Lens Projection"
Law of Light ..._..-.. 125
Refractive Index of Projection Lens Glass. . . . .... 143
Light Loss. Dirty Lenses Increase It. .,.,;... 141
Light Loss. Refractive Index of Glass Affects It 142
Light Loss Due to Slide Carrier ^.. 177
Projector Optical Train Consists of 125 to 126
Shape of "Spot" and What It Means 174
Ratio Light Source Is Magnified In Spot 175
Location of Crater Image 172
Importance of Size of Spot 173
Ghost Zone in Condenser Beam 177
Light Source Image Inverted at Spot 177
Adjusting Projector Optical Train,,,, ,,,.,,, ,-.-.... 179
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