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Paul Intermittent Movement.231,233 Perforations in Film ...216,217,253, 254, 259, 260 Perforations and Flickering. .217,218 Persistence of Vision 83 Petzval Objective .143,144 Phenekistoscope, The 14,15 Photography, Marey's 20 Photography, Muybridge's 20 Photometry 114 Pin Cross, The 236 Plane, The Focal 15C Plunger Intermittent Movement. 228 Pointolitc Lamp 188 Portable Projection Booth ...293,294 Portable Projector ..288,293 Potential, Constant 46, 47 Power, Electric .. 42 r and Fiier^;, 34,35 Power Expended on Lamp 181 Power Intermittent Movement, Care off ... .237,138 Power Plant, Portable 289,290 Power Take-Up . ..Ml.Ml rr's Loop Setter 'J4 Power's Speed Control 244,250 Praxinoscope, The 17,18 Praxinoscope, The Projecting. .18,19 Problems in Operating 29 •ction Booths 168 ection Lamp. The 48,49 Projection Machine, Interior of 17''.. 177 Projection Machine, Perfection of 25 Projection, Mechanics of 16 Projection Without Shutter 267 Projector, The Portable 288,293 Rate Units 31 Reel, The 213 Reels, Non-Rewinding 213 Reels, Sizes of 213 Reflection From Condenser Sur- face 151 Reflection From Lens Faces.. 110. iu Reflection, Internal 112 Reflection of Light 105,110,11:1 Refraction in Glass 1J7,129 Refraction of Light 103 Refraction of Rays of Light From Objects 135,136 Repairing Electric Machinery. .78, 80 Resistance 32, 38 Resistance, Ballast 66, 67 Resistance of Carbons 188 Resistance, Changes in 43 Resistances, Counteraction of... 98 Resistance, Extemporized 91,93 Resistance in Parallel 44 Resistance in Scries 44 Resistance and Size of Conduc- tors .43,44 Resistance, Storage Battery... .91,93 Resistance, Water 91 Rewinding the Film .. Rewinding Machines, Film...21.'. Rewinding Tables, Film . Rheostat, Coil 45 Rheostat, Field 86 Rheostat Wasteful ... 67 Rings, Connecting or Slip 61 Roller Dog Intermittent Move- ment ... Sanding Commutator .. .72 Sandstoning Commutator 73 en. The r Screen-Angle Screen and Angle of Sight Screen Image, Size of 7,160 Screen, Light Received by 117 Screen, Material for . 279 Screen, Porta 280 Screen, Stretching the . 279 Screen Surfac Screen, Tilting the Screens, Surfaces of 280 Screens, Translucent . 281 Screens, Wide an<l Narrow Angle, 285 Sellers, Coleman, M Series, Resistance in 44 nkage of Film ..226,227 .267,278 Shutter, Barrel ... Shur 170 Shutter of Booth Automatic. .170. 171 Shutter, Distance From Objective Shutter, Dynamic Balance of .. Shutter, Inside .. Shutter, Position of 269 Shutter, Radius of Shutter, Setting of Shutter, Static Balance of 276 Shutter, Synchronism with 1 quency of Alternating Current 272,274 Simplex Geneva Movement 229 Simplex Incandescent Lamp Ma- chine 210 Simplex Speed Control 250,251 Simplex Take-Up 23: Size of Image, Calculations of 160,167 Size of Image, Practical Rule for . 165,166 302