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CONTENTS. i K- ,■ • THE SOURCE OF THE LIGHT. ;Ci,0 The Current, Direct and Alternating. . Definition or Elec- trical Terms. How to Make Calculations. Rule of Thumb. WIRING. Insulation. Permanent Wiring. Wire Gauge Table. Lamp Consumption Tables. ■ Switches. . Switchboards. > Exit Light Circuits. Sta?:c Switchboards. Fuses. Wire Sys- tems. ( Scries Multiple. ■ High Potential Alternating System. Meters. RESISTANCE DEVICES. '' Rheostats. ' Transformers. Mercury Arc Rectifier. Motor Generator Sets. THE OPERATING ROOM. ^ Fittings for Operating Room. ' Tools. " Operating Room Switches. ' The Lamp. * The Lamp House. LENSES. Finding the Focal Length of Lenses and Finding the Size Lens Required to Project a Given Size Picture at a Given Throw. The Spot. The Principles of Optical Projection. The Selection of a Lens. 'Adjustment of Light. Condenser Breakage. ' CARBONS. Flow Carbons Are Made. Setting the Carbons. ' THE FILM. Proper Care of Film. ' Patching Film.' Wet Film. Remov- ing Emulsion. Leaders. Inspecting. > Film Jumping. > How Film Is Made. Speed.' The Throw.' MACHINE HEADS. * Cleaning and Oiling. ' Repairing. ' Adjusting Intermittent Gear.' Setting the Shutter, etc. I The Edengraph. ■ Edison. Lubin. Motiograph. Pathe. Power's. Standard. MISCELLANEOUS. The Stereopticon. Song Slides. Slide Carriers. Pedal Fire Shutter. Electric Meters. How to Read Meters. The Curtain. Effect of Daylight and House Lights on the Picture. Illuminating the Auditorium. Ventilation. Seating. Music. Bell Wiring. LOCATION AND MANAGEMENT. Selecting a Theater Location. Selecting a Small Town Location. Employees. Advertising. Film Service. Changes. Tickets. Vaudeville. Travelogues and Other Lectures.