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86 U. S. GOVERNMENT FILMS and landing on one engine; operation of instruments. (TF 1-3360; 25 minutes) How To Fly the B-26 Airplane U.S. Department of the Air Force, 1943. Pre-flight check; engine starting; take- off; flight characteristics of plane; in- strument reading and setting in flight; simple maneuvers; normal stall and re- covery; flying on one engine and emer- gency landing. For B-26 pilots. (TF 1-3301; 48 minutes) 7 How To Grow Hogs U.S. Department of Agriculture, 1930. Duroc-Jersey, Poland China, Chester White, and Tamworth boars, sows, and gilts; approved practices in feeding, pas- turing, weaning, and preventing parasitic and other diseases developed at U.S. Department of Agriculture Research Cen- ter, Beltsville, Md. (22 minutes, silent) 32, 41 How to Machine Aluminum U.S. Bureau of Mines in cooperation with Aluminum Co. of America, 1942. Alloys of cast and wrought aluminum; effect of alloying, heat treating, and cold working on machinability; use of hand and machine tools. (32 minutes) 17 How to Rivet Aluminum U.S. Bureau of Mines in cooperation with Aluminum Co. of America, 1942. Making different types of rivets; heat and cold treatment; riveting by hand, pneumatic hammer, and squeeze riveters; use of bucking-upset or dolly; blind riv- eting; use of explosive rivets; testing and removing defective rivets. (27 min- utes) 17 How to Use Navigational Aids U.S. Department of the Navy, 1944. (Aids to Navigation Series) How to use navigational aids and interpret symbols on nautical charts. (MN 202-ac; 7 min- utes, color) . 41 H 2 O U.S. Department of the Army in cooper- ation with National American Red Cross, 1948. Water safety on Corps of En- gineers' large floating work plants, reser- voirs, and dams. (34 minutes, color) 1$ The Human Body U.S. Office of Inter-American Affairs, 1945. (Health for the Americas Series) Value of the human body and one's re- sponsibility for its proper care. How the parts of the body work. An animated cartoon. Portuguese version "0 Corpo Humano" and Spanish version "El Cuerpo Humano" also available. (9 minutes, color) 32, 37 Hurricane Circuit U.S. Department of State, 1949. How warning center, Miami, Fla., reduces hur- ricane menace in Caribbean and Gulf of Mexico; operation of system; precautions against damage; rescue and relief meas- ures; international aspects; nature of hurricanes in animation. Released through U.S. Office of Education for educational use in the United States. (23 minutes) 32, 41 The Hydraulic Brake System U.S. Office of Education, 1945. (Automo- tive Operation and Maintenance Series. Preventive Maintenance No. 7) How to check brake pedal travel; examine the brake lining; adjust the brake shoes; and inspect and adjust the hydraulic brake fluid system. Supplementary filmstrip, same title, also available. (OE 483; 12 minutes) 32, 41 Hydraulic Brakes: Principles of Op- eration U.S. Department of the Army, 1944. Hydraulic brake system; operation; hy- draulic principle; advantage of liquid linkage and development of mechanical advantage. (TF 9-2065; 24 minutes) . 41