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MOTION PICTURES 175 Aeronautics, 1944. Technical film; title self-explanatory. (33 minutes, silent) 28 Slow-Motion Study of Normal Com- bustion, Preignition, and Knock in a Spark-Ignition Engine U.S. National Advisory Committee For Aeronautics, 1940. Technical film; title self-explanatory. (33 minutes, silent) 28 The Small Infantry Tank Team. Part 2: Attack Mission U.S. Department of the Army, 1949. How team works during a combat mission; factors which determine how the team advances; movement through different types of terrain, open fields, woods, defiles, etc.; artillery and mortar support. (TF 7-1541; 14 minutes) 41 Smoke Flow: Lift and Drag U.S. National Advisory Committee For Aeronautics, 1942. Technical film; title self-explanatory. Short version: "Study of Airflow by Means of Smoke." (66 minutes, silent) 28 Smoke j umper s U.S. Department of Agriculture, 1949. Training, equipment, jump techniques, and duties of parachute fire fighters in combating fire in remote roadless areas. (10 minutes, color, also b&w) 3, 32, 41 Smoke jumpers: Ground Training U.S. Department of Agriculture, 1947. (Smokejumpers Series No. 2) Physical conditioning preparatory to jump train- ing; getting accustomed to equipment. (18 minutes, color) 3, 32, 41 Smokejumpers: Indoctrination U.S. Department of Agriculture, 1947. (Smokejumpers Series No. 1) Classroom situation explaining use of parachutes and other equipment. (19 minutes, color) Smokejumpers: Jump Training U.S. Department of Agriculture, 1947. (Smokejumpers Series No. 3) Practice jumping and fighting routine fires. (20 minutes, color) 3, 32, 41 "Smokey Bear": Don't Blame Light- ning U.S. Department of Agriculture, 1950. Rules of safety with fire in the woods. Forest fire prevention trailer. (1 minute) 3, 32, 41 "Smokey Bear": It's Up To You U.S. Department of Agriculture, 1950. Appeal for help in preventing forest fires. Forest fire prevention trailer. (4 minutes) 3, 32, 41 "Smokey Bear": Once Upon a Time U.S. Department of Agriculture, 1950. Proper care of fire in woods. Fire pre- vention trailer. (5 minutes) 3, 32, 41 Snow Harvest U.S. Department of Agriculture, 1946. Value and hazards of snow surveys in Western mountains; techniques of meas- uring snow to forecast irrigation and other water supplies. (25 minutes, color) 4, 32, 41 Snowbound; Seapower for Peace U.S. Department of the Army, 1949. Winter 194849, the Armed Forces by air and ground get food and fuel to farmers and hay to animals in snow- bound areas. Men of the fleet trained to perform their technical task; new de- velopments in seapower, ships, machines, aircraft, and weapons. Includes "Sea- power for Peace" released by U.S. De- partment of the Navy. (AFSR 104; 10 minutes) 41 Soft Tissue Wounds U.S. Department of the Navy, 1944. (Medicine in Action Series) How to remove shell fragments from four typical battle wounds: upper thigh, scapula, leg, 3, 32, 41 and arm wounds; recommended treat-