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FILMSTRIPS 281 locking, squeezing, rotating and bending elements and how each control low fre- quency radio range courses. (FS 1-529; 42 frames) Radiodontics U.S. Department of the Navy, 1943. How radiograph is used to locate retained roots, impacted teeth, fractures, cavities, overhanging fillings, abnormal growths, and gum and teeth diseases. Special film for dental personnel. (SN 2204; 37 frames, synchronized disc, 21 minutes) 41 Radiotherapy: High Dosage Treat- ment U.S. Office of Education, 1945. (Nursing Series) Reviews material presented in motion picture, same title. (OE 411; 39 frames) 41 Radius of Action: Returning to Al- ternate or Moving Base U.S. Department of the Air Force, 1942. (Aerial Navigation Series. Dead Reck- oning No. 2) How to calculate radius of action thru development of factor dia- gram; effect of data change. (FS 1-68; 16 frames) 7, 41 Radius of Action: Returning to Same Base U.S. Department of the Air Force, 1942. (Aerial Navigation Series. Dead Reck- oning No. 1) How to define and calcu- late radius of action; determining fac- tors; terminology; and ideal solution. (FS 1-67; 17 frames) 7, 41 Raindrops and Erosion U.S. Department of Agriculture, 1947. How raindrops destroy topsoil, cause flood run-off, and accelerate harmful silt accumulation in streams and reser- voirs; based on experiments conducted by W. D. Ellison of U.S. Soil Conserva- tion Service. (50 frames: single; also double) . 39 Rat Eradication Measures on Rat- proofing Projects U.S. Public Health Service, 1947. Rat- proofing and eradication project tech- niques: survey for rat infestation; poi- soning with 1080 water and baits; trap- ping; checks; and, re-inspection. Photo- graphs and charts. (CDC-5-068; 78 frames, synchronized disc, 12 minutes) 27 Ratproonng of Existing Buildings U.S. Public Health Service, 1947. (Ty- phus Control Series) Habitat of rats, diseases carried, and types and extent of economic loss caused. Surveying need for ratproofing, preventive measures and periodic inspection to insure effective- ness. Photographs, drawing and forms. (CDC-5-067; 80 frames, synchronized disc, 14 minutes) 27 RCL: Resistance, Capacitance, In- ductance U.S. Department of the Navy, 1943. (Ra- dio Technician Training Series) Reviews material presented in motion picture, "RCL-Resistance Capacitance. Parts 1 and 2." (SN 1540-ac; 34 frames) 41 Reading a Drawing of a Valve Bon- net U.S. Office of Education, 1944. (Machine Shop Work Series. Fundamentals of Blueprint Reading No. 5) Reviews ma- terial presented in motion picture, same title. (OE 55; 30 frames) 41 Reading a Three-View Drawing U.S. Office of Education, 1945. (Machine Shop Work Series. Fundamentals of Blueprint Reading No. 2) Reviews ma- terial presented in motion picture, same title. (OE 52; 30 frames) 41 Reaming With Straight Hand Ream- ers U.S. Office of Education, 1943. (Machine Shop Work Series. Bench Work No. 4)