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34 U. S. GOVERNMENT FILMS nodular worms, stomach worms, round- worms, lungworms, and kidney worms. (28 minutes, silent) 32, 41 Control Surfaces U.S. Department of the Air Force, 1942. (Airplane Structures Series) Definition, location and function of ailerons, rudders, tail flaps, wing flaps, vertical fins, ele- vators, and horizontal fins; functions of trip tabs, fixed and adjustable; types of fabric coverings of these surfaces. (TF 1-214; 7 minutes) Controls U.S. Civil Aeronautics Administration in cooperation with Shell Oil Co., 1949. (How an Airplane Flies Series No. 6) How to use controls to modify straight and level flying: elevators for changing pitch; ailerons for rolling and banking, and rudder for turns. (10 minutes) 7 Conventional Signs U.S. Department of the Army, 1945. (Basic Map Reading Series No. 1) Presents each sign, then superimposes it on feature it represents and shows its relationship to other signs on map. (TF 21-2071; 19 minutes) 41 Conversion From Black Oil to Diesel Fuel: Navy Improved Method U.S. Department of the Navy, 1950. (Navy Tank Cleaning Procedures Series) Training film; title self-explanatory. (MN 6689-b; 24 minutes) 41 Conversion from Black Oil to Gas- oline: Navy Chemical Method U.S. Department of the Navy, 1950. (Navy Tank Cleaning Procedures Series) Training film; title self-explanatory. (MN 6689-c; 26 minutes) 41 Conveying and Measuring Irrigation Water U.S. Department of Agriculture, 1932. Devices and procedures developed by Bureau of Agricultural Engineering for measuring, proportioning, and conveying irrigation water; value of soil tests. (26 minutes, silent) 32, 41 Cooking and Carving of Meat U.S. Department of the Army, 1943. (The Army Cook Series No. 6) How to carve meat; how to make stew, braze meat, fry in deep fat, and cook by dry and moist heat methods. (TF 10-1138; 20 minutes) 41 The Cooling System and Fuel System U.S. Office of Education, 1945. (Automo- tive Operation and Maintenance Series. Preventive Maintenance No. 4) How to check for leaks in the cooling system; check the fan and water pump; me- chanical operation of the carburetor; filters and vents; fuel pump; and leakage in the fuel system. Supplementary film- strip, same title, also available. (OE 464; 22 minutes) 32, 41 Cooper Bessemer Diesel Engine Fuel System U.S. Department of the Navy, 1944. Fuel injection system; examination of the fuel pump; fuel delivery and pres- sure; functioning of the fuel injection nozzles. Animated diagrams. (MN 46-b; 14 minutes) 41 Cooperative Wool: From Fleece to Fabric U.S. Department of Agriculture, 1942. Story of wool from sheep to consumer; shearing; cooperative marketing associ- ations practices for direct efficient sell- ing; and wool manufacturing. (32 min- utes) 2, 32, 41 Copper Leaching and Concentration U.S. Bureau of Mines in cooperation with Phelps Dodge Corp, 1938. Recover- ing copper from old mine workings by leaching; concentrating low-grade ore for smelter: crushing; screening; grind- ing, separating by flotation; disposal of