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FILMSTRIPS 241 Elements of Hardening U.S. Office of Education, 1945. (Engi- neering Series. Heat Treatment of Steel No. 1) Reviews material presented in motion picture, same title. (OE 170; 40 frames) 41 Elements of Surface Hardening U.S. Office of Education, 1945. (Engi- neering Series. Heat Treatment of Steel No. 3) Reviews material presented in motion picture, same title. (OE 172; 36 frames) 41 Elements of Tempering, Normaliz- ing, and Annealing U.S. Office of Education, 1945. (Engi- neering Series. Heat Treatment of Steel No. 2) Reviews material presented in motion picture, same title. (OE 171; 31 frames) 41 Emergency Seaplane Repair U.S. Department of the Navy, 1943. How to temporarily seal holes in the hulls of flying boats and seaplanes both at sea and when beached. (SN 1996; 43 frames) 41 Endfeed Grinding a Tapered Pin U.S. Office of Education, 1944. (Machine Shop Work Series. Operations on the Centerless Grinding Machine No. 5) Re- views material presented in motion pic- ture, same title. (OE 89; 42 frames) 41 The Engine Assembly U.S. Office of Education, 1945. (Automo- tive Operation and Maintenance Series. Preventive Maintenance No. 3) Reviews material presented in motion picture, same title. (OE 463; 42 frames) 41 Engine Change: Installation U.S. Office of Education, 1945. (Aircraft Work Series. Power Plant Maintenance) Reviews material presented in motion picture, same title. (OE 273; 47 frames) . 41 Engine Change: Removal U.S. Office of Education, 1945. (Aircraft Work Series. Power Plant Maintenance) Reviews material presented in motion picture, same title. (OE 272; 50 frames) 41 Engine Instruments U.S. Department of the Navy, 1942. Function and use of airplane engine in- struments. (SN 802; 60 frames) Engine Lubricating System U.S. Coast Guard, 1942. How splash and pressure systems of lubrication are em- ployed in a modern engine. (59 frames) 41 Engine Tests and Tune Up U.S. Office of Education, 1945. (Auto- motive Operation and Maintenance Ser- ies. Preventive Maintenance No. 5) Re- views material presented in motion pic- ture, same title. (OE 465; 50 frames) 41 Eradicating Tuberculosis from Live- stock and Poultry U.S. Department of Agriculture, 1939. Types of tubercle bacilli causing disease in farm animals; tuberculin testing; ef- fects of disease; its prevention. (36 frames) 39 Eradication of Foot-aml-Mouth Di- sease in the United States U.S. Department of Agriculture, 1948. Symptoms of disease; importance of de- stroying diseased animals, cleaning and disinfecting premises, and reporting sus- pected cases to livestock authorities. (33 frames: single; also double) 39 Enroute Procedure U.S. Department of the Navy, 1944. (In- strument Flight Control Series. Airport and Airway Traffic Control Procedure No. 2) Actions taken by pilot enroute; how airway traffic control personnel keep each flight posted and issue instructions to insure safe passage during instrument weather conditions. Revision, same title,