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190 U. S. GOVERNMENT FILMS Council of National Defense, 1941. Work and accomplishments of TVA; how multi-purpose dams operate to help con- trol floods; aid navigation and produce power; how dams are constructed; agri- cultural work, rural electrification, re- search and reforestation. (20 minutes) 30, 40 Ten Thousand Fires U.S. Tennessee Valley Authority, 1942. Damage done by forest fires; how to prevent this waste. (20 minutes, color) 30, 40 Tension Testing U.S. Office of Education, 1944. (En- gineering Series) How a hydraulic ten- sion testing machine operates; how to prepare the machine and a specimen for a test; conduct the test to determine the specimen's elastic limit, yield point, and ultimate strength. Supplementary film- strip, same title, also available. (OE 348; 21 minutes) 32, 41 Terracing in the Northeast U.S. Department of Agriculture, 1939. Terracing in the soil conservation pro- gram; planning system, outlets for excess water; laying out terrace lines on con- tour; and machine operations. (11 min- utes) 4,32,41 Texas and Its Natural Resources U.S. Bureau of Mines in cooperation with Texas Gulf Sulphur Co., 1950. (State Film Series) Mineral and energy resources; agriculture; cattle and sheep raising; transportation facilities; indus- trial development; climate; and scenery. (43 minutes, color) 17 Then It Happened U.S. Department of Agriculture, 1948. Documentary record of Maine forest fire of 1947; scenes of raging fires; de- stroyed farms and villages; need for forest fire prevention and adequate fire control. Judged best film in general safety, 1948, National Committee on Films for Safety. (10 minutes, color) 3, 32, 41 That Men May Fly U.S. Department of the Air Force, 1949. Research activities and accomplishments of the Office of the Air Surgeon, the School of Aviation Medicine, and the Aero Medical Laboratory. (SFP 236; 28 minutes) 11, 32, 41 Theory and Principles of Operation, Automatic Shifting Unit U.S. Department of the Army, 1943. (Hydramatic Transmission Series No. 2) Chart analysis of different oil pressures in hydraulic control system of engine and action of pump; action of different parts of automatic shifting system and path of oil in diagram; transmission action at various speeds. (TF 9-1002; 15 minutes) 41 Theory and Principles of Operation, Fluid Coupling and Gear Train U.S. Department of the Army, 1943. (Hydramatic Transmission Series No. 1) Principles of operation and use of fluid coupling in combat vehicles; use of dif- ferent gears, shafts, ratios, and clutch pressure plates. (TF 9-1001; 26 min- utes) 41 Therapeutic Exercise: Introduction U.S. Department of the Army, 1947. (Professional Medical Films Series No, 5034. Therapeutic Exercise No. 1) Over- all view of therapeutic exercise in Army medicine; how much can be accom- plished through exercise in rebuilding broken bones. (PMF 5034; 17 minutes) 41 Therapeutic Exercise: Orthopedics U.S. Department of the Army, 1947. (Professional Medical Films Series No. 5051. Therapeutic Exercise No. 2) Tech- nique employed in treating serious in- juries of the knee joint; prescribed and supervised program of continuous and