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FILMSTRIPS 299 Using a Steady Rest When Boring U.S. Office of Education, 1944. (Machine Shop Work Series. Operations on the Engine Lathe No. 17) Reviews material presented in motion picture, same title. (OE 65; 39 frames) 41 Vacuum Tubes U.S. Department of the Navy, 1942. Theory of vacuum tubes operation; their function in the radio circuit. (SN 650; 37 frames) 41 Valve Types and Reversing Gears U.S. Coast Guard, 1943. (Ship's Engines Series) Eccentric action, construction and function of parts of various valve types and gears; how to reverse engine. (62 frames) 41 Vaned Elbow: Layout and Fabrica- tion U.S. Department of the Navy, 1943. (Shipbuilding Skills Series. Sheetmetal Work) Reviews material presented in motion picture, same title. (SN 2339-n; 60 frames) 41 Venereal Disease and Tuberculosis Survey In Georgia U.S. Public Health Service, 1948. (Ve- nereal Disease Series) How to conduct survey: careful planning; favorable pub- licity; cooperation of key people; local personnel trained; permanent and roving stations for X-rays and blood tests; and, confidential reports. Photographs. (CDC- 5-121; 112 frames, synchronized disc, 11 minutes) 27 Verniers U.S. Office of Education, 1943. (Machine Shop Work Series. Precision Measure- ment No. 4) Reviews material presented in motion picture, same title. (OE 4; 37 frames) 41 Vertical Welds, Steel U.S. Department of the Navy, 1942. Torch manipulation while making verti- 953821—51 20 cal welds on steel. Aircraft machine shop demonstration film. (SN 130; 41 frames) 41 Vises, Screwdrivers, Hammers and Pliers U.S. Department of the Air Force [1943?]. (Use and Care of Hand Tools Series No. 1) Different types of vises, screwdrivers, hammers, and pliers and how to use and properly care for each type. (FS 1-647; 68 frames) 7 Visualizing an Object U.S. Office of Education, 1945. (Machine Shop Work Series. Fundamentals of Blueprint Reading No. 1) Reviews ma- terial presented in motion picture, same title. (OE51; 29 frames) 41 The Vital Signs and Their Interrela- tion: Body Temperature, Pulse, Res- piration, Blood Pressure U.S. Office of Education, 1945. (Nursing Series) Reviews material presented in motion picture, same title. (OE 406; 81 frames) 41 Vivax Malaria U.S. Public Health Service, 1948. (Ma- laria Control Series) Biology of Plas- modium vivax malaria, the temperate zone malaria: distribution, clinical mani- festations, diagnosis, treatment and pre- vention of vivax infections. Photographs, drawings, and charts. (CDC-5-043; 76 frames, color, synchronized disc, 17 minutes) 27 Watertight Cover U.S. Department of the Navy, 1944. (Shipbuilding Skills Series. Sheetmetal Work) Reviews material presented in motion picture, same title. (SN 2339-0; 57 frames) 41 Waxing Dentures U.S. Department of the Navy, 1949. (Dental Prosthetic Laboratory Technique Series) Title self-explanatory. (SN