Motion-picture films have come to be recognized quite generally as a valuable and practical means of instruction in schools, college, and universities and for clubs and societies organized for educational purposes. The number of persons making such use of them is now very large and constantly becoming larger. To all these, a handbook of general information on motion-picture equipment, installation, handling, and repair, prepared with special reference to their needs, will be very helpful. A part of the problem will, from the nature of motion pictures, be mechanical--relative to equipment and its installation and use and to the handling of motion-picture films. It is with the hope of assisting users of motion pictures in the mechanical part of the problem that this pamphlet has been prepared. (Contains 1 footnote.) [Best copy available has been provided.]