A catalogue of selected 16mm. educational motion pictures (New York)

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126 Catalogue of Motion Pictures No. Service No. Subject Reels Charge 18-27 Menace of the Mississippi 2 1.00 Ravages during recent floods. Constructing new levees, canals, and creating flood districts. President Hoover's plan of flood control. 23-25 Glimpses of the Yosemite 1 .50 Famous falls and other features. Big Oak Flat Road. Tuolumne Big Trees. Tenaya Lake. Morro Lake. Wa- wona Big Tree. PHYSICS 9-5 Story of Compressed Air, The 2 1.00 How produced. Types of engines for making. Uses in industry. 9-15 Liquid Air 1 .50 Stages of compression. Effect upon different objects. Refrigeration with air. 9-3 Light of a Race 1 .50 Development of artificial illumination from primitive fire-making to incandescent lamp. 9-4 Revelations by X-ray 1 .50 Manufacture of Coolidge tube. Electrical action in pro- ducing x-rays. Power of 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. 6-5 Magnetism and Electro-Magnets 6 6.00 a week 6-3 Induction Voltage Regulators 2 1.00 9-2 Big Deeds 2 1.00 General Electric Company factory at Schenectady, N. Y. Huge hammer pounding a 12,000-pound billet into shape. Immense electric ovens. Research laboratories. 900,000- volt Coolidge cathode tube. X-ray. Broadcasting first television drama. Testing effects of lightning. Many other electrical experiments. 9-1 Beyond the Microscope 1 .50 Molecular construction of water. Physical changes pro- duced by vaporization and solidification. 16-78 The Span Supreme 7 3.00 Operations in construction of new Hudson River sus- per week pension bridge which will be repeated on Golden Gate Bridge.