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FILMSTRIPS 277 Preparing Blood Films for Micro- scopical Examination U.S. Public Health Service, 1947. (Ma- laria Control Series) How to prepare thick and thin blood slides for laboratory diagnosis of malaria. Techniques used for adults, and small children. How to clean slides. Photographs and titles. (CDC-5-071; 66 frames, color, synchro- nized disc, 11 minutes) 27 Preparing Old Buildings for Wiring U.S. Office of Education, 1945. (Electri- cal Work Series. Wiring) Reviews ma- terial presented in motion picture, same title. (OE 378; 50 frames) 41 Preserve the Original Strength U.S. Department of the Navy, 1942. Ex- plains tension, compression, shear, bend- ing, torsion, monocoque and semi-mono- coque fuselages and "stressed" skin type of wing structure. (SN 294; 57 frames) 41 Pressure Gages U.S. Department of the Air Force, 1942. (Instruments Series) Application of pressure gages on aircraft; Bourdon, diaphragm, aneroid mechanisms. (FS 1-52; 52 frames) 41 Pressure Sealing U.S. Coast Guard, 1943. (Ships Engines Series) Purpose of pressure sealing; kinds of steam, air, ammonia, and oil packings; packings for fixed joints and movable parts; materials from which made. (69 frames) 41 Prevent Farm Fires U.S. Department of Agriculture, 1944. How to eliminate fire hazards by fireproof construction, replacements, approved wir- ing, and careful handling and storing of combustible materials. (38 frames: sin- gle; also double) . 39 Primary Trainer U.S. Department of the Air Force [1943?]. (Airplane Cockpit Instruments and Controls Series No. 1) Name, func- tion and location of cockpit instruments in Air Force primary trainer PT-19A. (FS 1-377; 44 frames) 7 Primary Treatment Plants U.S. Public Health Service, 1950. (Mu- nicipal Sewage Treatment Plants Series No. 1) Reviews material presented in motion picture. (CDC-5-138; 47 frames, synchronized disc, 7 minutes) 27 Principal Dimensions, Reference Sur- faces and Tolerances U.S. Office of Education, 1945. (Machine Shop Work Series. Fundamentals of Bluprint Reading No. 3) Reviews ma- terial presented in motion picture, same title. (OE 53; 25 frames) 41 Principle of Moments U.S. Office of Education, 1945. (Engi- neering Series. Fundamentals of Mechan- ics) Reviws material presented in mo- tion picture, same title. (OE 362; 29 frames) 41 Principles of Dry Friction U.S. Office of Education, 1945. (Engi- neering Series) Reviews material pre- sented in motion picture, same title. (OE 365; 36 frames) 41 Principles of Gas-Filled Tubes U.S. Office of Education, 1945. (Engi- neering Series. Electronics No. 4) Re- views material presented in motion pic- ture, same title. (OE 353; 36 frames) 41 Principles of Gearing: An Introduc- tion U.S. Office of Education, 1945. (Engi- neering Series. Fundamentals of Me- chanics) Reviews material presented in