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MOTION PICTURES 51 El Centra de Salubridad U.S. Institute of Inter-American Affairs, 1947. Spanish version of "Your Health Center." Portuguese version "A Poli- clyinica Da Sua Cidade" also available. (8 minutes, color) 37 The El Isleo-Eastern Glade Incident U.S. Department of the Navy, 1943. (Rules of the Nautical Road Series) Title self-explanatory. (MN 202-s; 5 minutes, color) 41 Elaboragao de uma Pec.a no Prato ou Bucha U.S. Office of Education in cooperation with U.S. Office of the Coordinator of Inter-American Affairs, 1945. (Trabalho de oficina mecanica. Usos de tomo de precisao) Portuguese version of "Machin- ing Work Held in Chuck: Use of Refer- ence Surfaces." Spanish version, "Elabora- cion de Una Pieza en El Plato," also available. (OE 60-Port.; 24 minutes) 32, 41 Elaboration de unu Pieza en el Plato U.S. Office of Education in cooperation with U.S. Office of the Coordinator of Inter-American Affairs, 1945. (Trabajo de taller mecanico. Usos del tomo de precision) Spanish version of "Machining Work Held in Chuck: Use of Reference Surfaces." Portuguese version "Elaboragao De Uma Pega No Prato Ou Bucha," also available. (OE 60-Span; 24 min- utes) 32, 41 Elastic Impression Materials in Crown, Bridge and Inlay Prosthesis U.S. Department of the Navy, 1949. Title self-explanatory. (MN 2050-b; 25 minutes, color) 41 Electrical Circuit Faults U.S. Office of Education, 1945. (Electrical Work Series. Wiring) How to test for and locate common circuit faults, grounds, resistance deterioration, and in- terference in circuits. Supplementary film- strip, same title, also available. (OE 375; 19 minutes) 32, 41 The Electron: An Introduction U.S. Office of Education, 1944. (Engineer- ing Series. Electronics No. 1) Nature of electrons; electron flow in solid con- ductors; electromotive force; types and control of electron flow; electron flow and magnetic fields. Animation. Supple- mentary filmstrip, same title, also avail- able. (OE 175; 16 minutes) 32, 41 Elementary Optics in Photography U.S. Department of the Navy, 1948. (Fundamentals of Photography Series) Fundamentals of still- and motion pic- ture photography. (MN 5384; 18 min- utes) 32, 41 Elementary Tactics of Lifesaving U.S. Department of the Navy, 1942. How to gain control of victim by sur- face and underwater approach. (MN 1319-b; 22 minutes) 7 Elements of Electricity U.S. Department of the Army, 1942. (Electricity and Magnetism Series No. 1) Analysis of matter, molecule to atom; elementary explanation of proton and electron and their relationship to elec« tricity. (TF 11-622; 14 minutes) 41 Elements of Electricity as Applied to Ignition Systems U.S. Department of the Air Force, 1941. (Aircraft Engines Series) Elementary phenomena in electricity and magnetism; application of these principles to engine ignition systems. (TF 1-136; 28 min- utes) 7, 32, 41 Elements of Hardening U.S. Office of Education, 1945. (En- gineering Series. Heat Treatment of Steel No. 1) How steel is quench- hardened; how the structure and hard- ness of steels with different carbon con-