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U. S. GOVERNMENT FILMS Acrobatic Checks. Part 6 U.S. Department of the Navy, 1943. (In- termediate Acrobatics Series) Acrobatic checks for flipper turn; loop; right and left slow rolls; right chandelle; right and left precision spins; importance of staying with check range. "Joe Student" film. (MN 1325g; 19 minutes) 7, 41 Acrobatics U.S. Department of the Air Force, 1943. Operation of controls and their effect on attitude of plane in animation. Funda- mental techniques and errors in such maneuvers as loop, half roll and reverse, Immelman, snap roll, slow roll, and ver- tical reverse. (TF 1-505; 19 minutes) 7 Across-the-Line Starters U.S. Office of Education, 1945. (Electrical Work Series. Motor Control No. 2) Theory and operation of a manually operated thermal overload switch, a mag- netically operated across-the-line starter, a drum reversing switch for a three-phase motor, and a magnetic reversing switch. Animation. Supplementary filmstrip, same title, also available. (OE 389; 15 min- utes) 32, 41 Acrylic Jacket Crown Construction U.S. Department of the Navy, 1948. Dentistry film; title self-explanatory. (MN 5371; 35 minutes, color) 41 Action Highlights of the War U.S. Coast Guard, 1946. Memorable war scenes shot by Coast Guard cameramen. (10 minutes) 21 Action of the Extra-Ocular Muscles U.S. Department of the Navy, 1945. Structure and function of extra-ocular muscles; how to diagnose typical muscle defects; particularly latent paresis and paralysis. (MN 3483; 8 minutes, color) 41 Active Peacetime Service U.S. Coast Guard, 1947. Coast Guard's general activities and peacetime duties; flood work; weather patrol, navigation aids, etc. (28 minutes) 21 Activities and Operations of the Sub- sistence Mobile Laboratory in the Field U.S. Department of the Army, 1945. Title self-explanatory. (FB216; 18 min- utes) 41 Activity for Schizophrenia U.S. Veterans' Administration, 1951. How modern concepts of activity are applied to distinctive needs of schizophrenic patients; how corrective therapists under guidance of psychiatrists motivate pa- tients from lower levels of activity to more socialized areas by establishing strong interpersonal relationships through the sensory appeal of intensified physical activities. (25 minutes) 31, 32, 41 Adding or Removing Refrigerant U.S. Office of Education, 1945. (Refrig- eration Service Series. Domestic Units No. 4) How to check a domestic refrig- eration system for lack of refrigerant; add refrigerant by weight; add an un- measured amount of refrigerant; and remove refrigerant. Supplementary film- strip, same title, also available. (OE 441; 17 minutes) 32, 41 Adjusting and Checking the Expan- sion Valve U.S. Office of Education, 1945. (Refrig- eration Service Series. Domestic Units No. 7) Design and operation of the bel- lows type and the diaphragm type auto- matic expansion valve; how to adjust, check, and service the bellows type valve. Supplementary filmstrip, same title, also available. (OE 444; 21 min- utes) 32, 41 Adjusting and Repairing the Thermo Expansion Valve U.S. Office of Education, 1945. (Refrig- eration Service Series. Commercial Sys- tems No. 1) Theory of multiple refriger-