Handbook of projection for theatre managers and motion picture projectionists ([1922])

MANAGERS AND PROJECTIONISTS Difference in Piano Convex, Meniscus and Bi-Con vex Lenses 168-169 Conjugate Foci — What It Is 127 Working Distance— What It Is 129-152 Equivalent Focus— What It Is 129-152 Spherical Aberration — What It Is 129 Chromatic Aberration — What It Is 130 Meaning of Focal Length as Applies to Simple Lens. 134 Action of Light Through Lenses 131 Correcting a Lens — What It Means 132 How Curvature of Simple Lens Is Determined 134-135 How Lens Forms an Image 133-134 Why It Is Impossible to Focus Condenser Beam to a Point — Figure 30 and Pages 135-136 To Trace Light Rays Through Lenses 209 Light Action in General Density of Light at Different Distances 125-161 Absorption of. Light— What It Means 19 Actinic Ray— What It Is 19 Angle of Incidence — What It Is 20 Angle of Reflection— What It Is 20 Angle of Projection— What It Is 20 Candle Foot, or Foot Candle— What It Is 23 Standard Candle— What It Is 23 Chromatic Aberration — What It Is 130 Critical Angle— What It Is 26 Diverging Beam — What It Is 26 Diffusion of Light— What It Is 27 and 222 Refraction— What It Is 127 What Controls Amount of Bending of Rays 127-128 Light Source, The Also see Arc, The Comparison of D. C. and A. C. Craters 390 Comparison of High Intensity and Ordinary Craters. 869 Using A. C. at Arc for Projection 390 Candle Power of Crater 379 and 392 Data Columbia Positive and Silvertip Negatives 393 High Amperage Wasteful 394 Data Directo Positive and Holdark Negatives 395 What Happens When Amperage Is Increased 395 Why 120 Amperes Is Limit of Amperage 395 to 399 Arc Voltage 399 and 400 Setting the Carbons 402 Testing Side Line of Carbons 404