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264 U. S. GOVERNMENT FILMS of Clouds Series No. 3) Types, identify- ing characteristics and symbols of low clouds; 17 samples of typical clouds for the viewer to identify. (FS 1-913; 26 frames, color) .. 7 Low Frequency Adcock Radio Range Equipment and Field Patterns U.S. Department of the Air Force, 1943. Components of low frequency Adcock radio range equipment and theoretical field patterns produced by this equip- ment. (FS 1-528; 32 frames) 7 The Lung. Part 1: Comparative Anatomy and Normal Histology U.S. Public Health Service, 1948. (Or- gans in Health and Disease Series) In- vertebrate and vertebrate respiratory systems, their evolution and comparative efficiency, and the anatomy and histology of the human lung. (CDC-5-035; 106 frames, color, synchronized disc, 15 min- utes) 27 Machining a Cast Iron Rectangular Block U.S. Office of Education, 1942. (Machine Shop Work Series. Operations on the Shaper No. 2) Reviews material pre- sented in motion picture, same title. (OE 20; 52 frames) 41 Machining a Tool Steel V Block U.S. Office of Education, 1942. (Machine Shop Work Series. Operation on the Shaper No. 3) Reviews material pre- sented in motion picture, same title. (OE 21; 33 frames) 41 Machining Laminated Plastics U.S. Office of Education, 1945. (Plastics Series No. 10) Reviews material pre- sented in motion picture, same title. (OE 475; 39 frames) .. 41 Machining Work Held in Chuck: Use of Reference Surfaces U.S. Office of Education, 1944. (Machine Shop Work Series. Operations on the Engine Lathe No. 12) Reviews material presented in motion picture. (OE 60; 41 frames) 41 The Magnetic Compass U.S. Coast Guard, 1944. (Piloting Series) Construction and operation of magnetic compass; disassembly of cross section. (39 frames) 41 Magnetic Instruments U.S. Department of the Navy, 1943. (In- strument Flight Control Series) Opera- tion of magnetic compass; easterly, west- erly variation; objects affecting; purpose of weight mass; compensating dia- phragm; compass compensator; compen- sating magnets. (SN 1059-c; 55 frames, synchronized disc, 23 minutes) 41 Maintenance of Storage Batteries U.S. Department of the Navy, 1942. How to install, inspect, service and recharge a storage battery. (SN 931; 52 frames) .... 41 Make Your Chalk Talk U.S. Department of the Navy, 1942. How to prepare and use blackboard and chalk in instruction; use of compass and straight edge. (SN 101; 56 frames, syn- chronized disc, 30 minutes) 41 Making a Cold Bend on a Hand Powered Machine U.S. Office of Education, 1944. (Ship- building skills series. Pipefitting No. 4) Reviews material presented in motion picture, same title. (OE 108; 49 frames) 41 Making a Core Box for a Flanged Pipe Elbow U.S. Office of Education, 1945. (Preci- sion Wood Machining Series. Funda- mentals of Patternmaking No. 10) Re- views material presented in motion pic- ture, same title. (OE 330; 40 frames) . 41