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278 U. S. GOVERNMENT FILMS motion picture, same title. (OE 363; 37 frames) 41 Principles of Liquids and Gases U.S. Department of the Air Force, 1942. Basic physical principles as applied to liquids and gases; their application to the hydraulic system of the airplane. (FS 1-22; 75 frames) 41 Principles of Lubrication U.S. Office of Education, 1945. (Engi- neering Series) Reviews material pre- sented in motion picture, same title. (OE 355; 33 frames) 41 Principles of Operation (AN/ARN-1) U.S. Department of the Navy, 1944. (Ra- dio Altimeter Operation Series) How radio altimeter overcomes aneroid alti- meter shortcomings; characteristics of radio altimeter's scale; how graduated; accuracy of indications at different lev- els; location and utilization of ARN-1 model units in maintaining fixed altitude flight. (SN 2745-a; 67 frames) Principles of Refrigeration U.S. Office of Education, 1944. (Engi- neering Series) Reviews material pre- sented in motion picture, same title. (OE 360; 44 frames) 41 The Production and Processing of Oysters U.S. Public Health Service, 1948. (Shell- fish Sanitation Series) Reviews material presented in motion picture, same title. (CDC-5-098; 90 frames, synchronized disc, 9 minutes) , 27 Production of High-Quality Cream for Butter Making U.S. Department of Agriculture, 1937. How clean practices in milking, clean farm surroundings, prompt cooling, and frequent delivery assure high-quality cream. (30 frames) . 39 The Production of Maple Syrup U.S. Department of Agriculture, 1948. Process used and value of maple-syrup production in United States. (59 frames: single; also double) 39 Propagation of Trees and Shrubs by Vegetative Means U.S. Department of Agriculture, 1940. How to use stolons, layers, cuttings, grafts, buds, sprouts, and root stocks to insure true perpetuation. (47 frames) 39 Properties of Photographic Lenses U.S. Department of the Air Force, 1942. Function of lenses; pinhole lenses; focal length of lenses; size of image; necessity for focusing lens; inversion of the image ; circle of confusion; types of single lenses; chromatic aberration, achromatic lens, spherical aberration, curvilinear distortion, anastigmat lenses. (FS 1-47; 65 frames) 41 Protection Against Flashburns U.S. Department of the Navy, 1944. Causes of flashburns; protective cloth- ing. (SN 4420; 109 frames, synchro- nized disc, 12 minutes) 41 Protection From X-Rays U.S. Public Health Service, 194?. Dan- ger of overexposure; amount of radiation at various positions around equipment; correct position of operator and safety checks. For operators, nurses, and as- sistants. (59 frames, synchronized disc, 15 minutes) 26 Protection of Metals. Part 1 U.S. Department of the Navy, 1942. Why and how to apply protective cover- ings to metals in aircraft construction and maintenance. (SN 185-a; 53 frames) 41 Protection of Metals. Part 2 U.S. Department of the Navy, 1942. Why and how to apply protective cover- ings to metals. (SN 185-b; 30 frames) . 41