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MOTION PICTURES 45 Diesel Lubrication and Cooling Sys- tems U.S. Department of the Navy, 1942. Parts of Diesel lubricating and cooling systems and how they work in relation to each other. Diagrams, animation, and straight photography. (MN 45-a; 9 min- utes) 41 Diesel Lubrication and Cooling Sys- tems: Lubrication of the GM-71 Series Engines U.S. Department of the Navy, 1943. Course of oil through the engine; how it lubricates each component part; and the working principle of the ventilation system. Animation: (MN 45-6; 12 min- utes) 41 Dimpling and Countersinking U.S. Office of Education, 1943. (Aircraft Work Series. Assembling and Riveting No. 4) How dimpling and countersinking prepare metal for flush riveting; how to operate a dimpling machine; and coun- tersink work for flush rivets. Supplemen- tary filmstrip, same title, also available. (OE 139; 21 minutes) 32, 41 The Diode: Principles and Applica- tions U.S. Office of Education, 1945. (Engineer- ing Series. Electronics No. 2) Principles of electron flow across a gap; basic features of the diode tube; control of electron flow in the tube; photoelectric cells; X-ray tubes; the diode as a recti- fier. Animation. Supplementary filmstrip, same title, also available. (OE 176; 17 minutes) . 32, 41 Direct Current Controllers U.S. Office of Education, 1945. (Electrical Work Series. Motor Control No. 1) Shunt motors and direct current con- trollers in operation; a direct current faceplate controller connected to a shunt motor. Animation. Supplementary film- strip, same title, also available. (OE 388; 15 minutes) 32, 41 Direction, Orientation, and Location with Compass U.S. Department of the Army, 1945. (Basic Map Reading Series No. 3) How compass functions; differences be- tween true magnetic and compass north; how to compute true north, and orient compass with map to determine course. (TF 21-2073; 34 minutes) 41 Direction, Orientation and Location Without a Compass U.S. Department of the Army, 1945. (Basic Map Reading Series No. 4) How to compute distance, locate objects on map, use horizontal and vertical lines, map symbols for different types of roads, road crossings, bridges, fords, ferries, and buildings; and use sun and stars to determine a correct course. (TF 21-2074; 22 minutes) 41 Disassembling the Engine U.S. Office of Education, 1945. (Aircraft Work Series. Power Plant Maintenance) How to remove the oil sump, valve tap- pet, and gear case cover assemblies; separate crankcase; remove crankshaft assembly and camshaft; disassemble crankshaft and gear case cover assem- blies. Supplementary filmstrip, same title, also available. (OE 268; 13 minutes) 32, 41 Disassembly U.S. Department of the Navy, 1945. (General Motors 16-278A Diesel Engine Series) How to inspect the blower rotors and pistons, remove head and scrape wear ridge; removal of connecting rod bearing; and pulling of one piston and one liner in piston assembly. (MN 3707- a; 35 minutes) 41 Disassembly. Part 1 U.S. Department of the Navy, 1944. (Cooper Bessemer Diesel Engine Main-