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68 Catalogue of Motion Pictures No. Service No. Subject Reels Charge *25-100 Principles of Current Generation 2 2.00 & 101 Theory and construction of A. C. and D. C. generators. *25-102 Principles of Electrical Measurement 4 4.00 to 105 Fundamental measurements. Electrical standards. Theory and construction of electrical measuring instru- ments. Voltmeters. Ammeters. Wattmeters. Power-fac- tor meters. Synchroscopes. Frequency meters. Ther- mometers. 25-135 Revelations by X-Ray 1 .50 Manufacture of Coolidge tube. Animated drawings show electrical action in producing X-rays. Power of the X-ray to reveal inner structure of opaque objects. Action of bones of hand, wrist, elbow, knee, ankle, and foot. How X-rays have assisted modern science. 25-142 Wizardry of Wireless, The 2 1.00 Development of signal communication. Beacon fire, helio- graph, semaphore, Indian smoke blanket, wigwagging, telegraph, telephone, and radio. Animated drawings ex- plain electrical action and function of apparatus em- ployed in radio transmission and reception. *25-79 Communication "by Electricity 1 1.00 Early methods of communication. The electric bell and the telegraph. The undersea cable. The telephone. How we hear. The ear and the telephone. 25-140 Light of a Race, The 1 .50 History and development of artificial illumination. 25-164 Big Deeds 2 1.00 Through General Electric Company factory at Schenec- tady, N. Y. Huge hammer pounding 12,000-pound billet into shape. Immense electric ovens. Research labora- tories. 900,000 volt Coolidge cathode tube. X-ray. Broad- casting first television drama. Testing effects of light- ning and other electrical experiments. 25-141 Busy Body, The 1 .50 Machine processes involved in manufacture of smallest electric motor. 25-167 Greater Campus, The 2 1.00 Through plants of General Electric Company. Assign- ments given "test men" or student engineers. * Film lesson available. See introductory paragraph on page [v].