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INDEX Aberration, Chromatic 130, 131 Aberration, Spherical 131,132 A. C. and D. C 61 Achromatic Lens, The 130,131 Actual Focus 133 Adjusting Lamp in Projector... 220 Adjustment of Condensers 183 Adjustment of Lower Carbon .. 194 Alternating Current Arc Lamp 187, 188 Alternating Current in Projection 61, 62 Alternating Current Lamp, Car- bons in 195 Ampere Theory of Magnetism.. 57 Ampere, The 37 Aperture, The Lens 140 Arc Control, Hallbergs 199,200 Arc Feed Control 199 Arc Lamp, Alternating Current 187, 188 Arc Lamp, Cable Clamps in . . 191,192 Arc Lamp, Care of 98,100 Arc Lamp, Details of 193 Arc Lamp, Dust from 182 Arc Lamp, High Intensity. ..201,206 Arc Lamp, Lugs in. 190 Arc Lamp, Operating the 188 Arc Lamp, Resistance of an.... 49 Arc Lamp, Stereopticon 197 Arc Lamp, The 28 Arc, Resistance in 97,98 Arithmetic, Notes on 38,39 Automatic Shutters for Booth, Objections to 171,172 Autotransformer, The 64,65 Back Focus, The 138,156 Balance in Three Wire System. . 50 Ballast Resistance 66, 67 Barrel Shutters 276,277 Bearings, Generator 76 Bearings, Motor and Generator.. 76 Blades, Flicker 269 Booth, Doors and Windows of.. 172 Booth, Laws Affecting 169,170 Booth, Material of 172, 173 Booth, Portable Projection.. 293,294 Booth, Projection 168 Booth, Shutters in 170 Booth, Size of 173 Booth, Ventilation of 173 Brightness of Image 109,110 Brushes, Motor and Generator. .74, 75 Brushes, Putting in New 75 Brushes, Spring Pressure on 78 Burning of Film 168 Burning of Film, Precautions... 168 Cable Clamps in Arc Lamp.. 190,191 Calculation of Size of Image. 160,167 Camera, Motion Picture 22,23 Carbon Holders 188,190 Carbon, Lower, Adjustment of.. 194 Carbon Savers 191 Carbons for Arc Light 186,187 Carbons, Position of. 191,192,194,195 Carbons, Resistance of 188 Carbons, Resistance of Hot .... 100 Celluloid Film, The 22 Cement for Mending Films 256 Choke Coil, Action of the 64 Chromatic Aberration 130,131 Circular Mils 46 Claw Intermittent Movement ... 224 Cleaning Lenses 145,146 Coil, Action of the Choke 64 Color and Light 129 Commutator Bars 71, 72 Commutator, Cleaning the 75,76 Commutator, Sanding of 72 Commutator, Sandstoning of ... 73 Commutator Slots, Filing 74 Commutator, Sparking on 72 Commutator, Surface of 73 Commutator, Turning up 74 Commutators 70 Commutators, Grooved 72 Compensarc, The 83,89 Condenser Adjustment 183 Condenser, Herschel 147 Condenser Holders 183 Condenser Mount 182 Condenser, Position of 148 Condenser Tank, Glass Plates in. 150 Condenser Types 146,147 Condenser, Water 149 Condensers 146,152 Condensers, Lining up of ... 151,152 Condensers, Setting 151,152 Conductance 32,33 Connecting Rings 61 Constant Potential System 46,47 Control, Arc Feed 199 Converters 69,70 Cores, Field 69, 70 Corrugated Lens in Condenser... 151 Coulomb, The 36 39?