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Electric Rewinding Machines. Film Polishing Machine. The Perforations of the Film and Their Determination. Leader and Trailer of the Film. Permissible Pull on the Film in the Opera- tion of the Machine. The Danger of the Film Ignit of Fire Overestimated. Ignited Film in Operating Mac! Precautions When Machine Stops Working. The I^unp and Film Fires. Ignition of Film Due to Stoppage of Mac! Protection of Film from Ignition. The Fire Shutter and the Film. Breakage of Film Below the Gate. The Urban-Joy- Harris Anti-Firing Device. CHAPTER XV The Shutter of the Motion Picture Projector. Projection With- out Shutter. Function of the Shutter. Persistence of Yi Flickering. Present Construction of Shutter. OjK-rntion of Shutter. The Flicker Wings of the Shutter. Position of the Shutter. Inside Shutters. The Three Blade Oi: tk-r. The Setting of the Shutter and Travel Ghost. The Settir. the Shutter. Angular Positoin of Blades of Shutter. Wid- Shutter Blades. Synchronism of Shutter and Cycles of Alternat- ing Current. Radius of the Shutter. Distance of Shutter from Objective Lens. Dynamic Balance of Shutter. Static I'alance of Shutter. The Barrel Shutter. Advantage of Inside Shutt CHAPTER XVI The Screen. Stretching the Screen. Small Screens. Mate- rial for Screens. Portable Screens. Sheet Screens. Smootl of Screen. Screen Surfaces. Translucent Screens for Rear Pro- jection. The Surface of Screens and the Anirlr of Si^ht. Varieties of Surfaces of Screens. Jones' and Hillis' Paper on Screens. Wide Angle and Narrow An-lr Screens. The ('cm- promise Surface for Screens. The Lux Screen. The So-Called Keystone Effect. Tilting and Shifting the Screen. Reshaping the Gate to Overcome the Keystone Effect. CHAPTER XVII The Portable Projector. The Haltberg Portable Projector. Still Projection With the Portable Projector. Power Plant for the Hallberg Portable Projector. Course of the Film in the Port- able Projector. Automobile Electric Generator for the Portable Projector. Projecting with the Starting Battery of an Automo- bile. Portable Projection Booth. Projecting at Different Speeds. Projecting the Motion of Slow Moving Things. Slow Speed Projection. Studying Efficiency by Projection. Photography by the Electric Spark. 10