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182 U.S. GOVERNMENT FILMS manufacture. Animated drawings visual- ize action in battery while charging and discharging. Sound revision, same title, also available. (30 minutes, silent) 17 The Story of Wendy Hill U.S. Public Health Service and the American Diabetes Association, 1949. Story of a young wife who finds she has diabetes, becomes frightened, seeks the advice of her doctor, and learns that with the help of insulin she can continue to lead a normal healthy life. Presented jointly by the U.S. Public Health Service and the American Diabetes Association. (19 minutes, color) 26, 32, 41 Straddle and Surface Milling to Close Tolerances U.S. Office of Education, 1941. (Machine Shop Work Series. Operations on the Milling Machine No. 2) How to rough mill four sides of solid bar stock and finish the same piece to a given size and shape. Supplementary filmstrip, same title, also available. (OE 13; 27 min- utes) 32, 41 Straddle Milling U.S. Office of Education, 1941. (Machine Shop Work Series. Operations on the Milling Machine No. 3) How to straddle mill the bosses on connecting rods to the proper width when the connecting rods are held in a fixture. Supplementary filmstrip, same title, also available. (OE 14; 17 minutes) 32, 41 Straight and Level Flight U.S. Department of the Air Force, 1943. Effect of controls and how they work; part played by thrust, drag, lift and gravity in operation of an airplane; im- portance of body posture and use of trim tabs. For pilots. (TF 1-3307; 17 minutes) 7 Straps and (Transportation) Bridles U.S. Department of the Army, 1943. (Military Stevedoring Series No. 5) How to attach straps and bridles to various types of draughts, handle in vertical position and use dunnage properly. (TF 55-1119; 14 minutes) 41 Strategic Air Power U.S. Department of the Air Force, 1950. Mission of Strategic Air Command and how S.A.C. men and planes carry out this mission; authentic World War II combat scenes show importance of long range bombing and establishment of strategic concept; B-36 training flight; mid-air refueling of B-50 medium bomb- ers; B-29's raid on Korean targets. (SFP 260; 25 minutes) 11, 41 Strength of the Hills U.S. Department of Agriculture, 1941. Role of forests in community life of Ohio hill country and Ozark Mountains; need for forest fire prevention. (11 min- utes) 3, 32, 41 Striking Back Against Rabies U.S. Public Health Service, 1950. (Rabies Control Series) Typical county rabies epidemic checked by joint emergency control measures of county health de» partment, state public health veterinarian and federal rabies control expert. (CDC- 4-087; 11 minutes) 27, 41 Structural Units, Materials, and Loads for Which Designed U.S. Department of the Air Force, 1941. (Airplane Structures Series) The four structural units of an airplane; fuselage, wings, control surfaces, and landing gear; positive and negative loads which each must withstand. (TF 1-211; 8 minutes) 7, 32, 41 A Study of Air Flow in an Engine Cylinder U.S. National Advisory Committee For Aeronautics, 1938. Technical film: title self-explanatory. (17 minutes, silent) 28 Study of Airflow by Means of Smoke U.S. National Advisory Committee For Aeronautics, 1942. Technical film; title