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224 U. S. GOVERNMENT FILMS Basic Principle of Reciprocating En- gine U.S. Coast Guard, 1943. (Ship's Engines Series) In diagrams, steam cycle of re- ciprocating engine, construction, principal parts, method to get steam in and out of cylinder, how parts of assembly oper- ate during double stroke of piston. (81 frames) 41 Bathing the Patient: Home Care U.S. Office of Education, 1945. (Nursing Series) Reviews material presented in motion picture, same title. (OE 403; 52 frames) 41 The Battery, Ignition, and Electrical System U.S. Office of Education, 1945. (Automo- tive Operation and Maintenance Series. Preventive Maintenance No. 2) Reviews material presented in motion picture, same title. (OE 462; 55 frames) 41 Beaching and Launching Small Sea- planes and Amphibians U.S. Department of the Navy, 1943. Procedure and gear for launching and beaching single and double float sea- planes and amphibians. Revision. (SN 2785; 56 frames) 41 Beaching and Launching VP Boats U.S. Department of the Navy, 1942. How to beach and launch a large flying boat. (SN 823; 64 frames) 41 Bending Copper Tubing to a Wire Template U.S. Office of Education, 1944. (Ship- building Skills Series. Coppersmithing No. 1) Reviews material presented in motion picture, same title. (OE 102; 37 frames) 41 Bending to a Cleat U.S. Coast Guard, 1943. Reviews material presented in motion picture, same title; also shows how to tie a weather hitch, (15 frames) 41 Bevel Protractor U.S. Office of Education, 1945. (Machine Shop Work Series. Precision Measure- ment No. 7) Reviews material presented in motion picture, same title. (OE 50; 34 frames) 41 Beveling, Mitering, Rabbeting, and Dadoing U.S. Office of Education, 1945. (Precision Wood Machining Series. Operations on the Variety Saw No. 2) Reviews material presented in motion picture, same title. (OE 307; 35 frames) 41 Beveling, Stop Chamfering, and Tapering Square Stock U.S. Office of Education, 1945. (Precision Wood Machining Series. Operations on the Jointer No. 2) Reviews material presented in motion picture, same title. (OE303; 62 frames) 41 The Big Count U.S. Bureau of the Census, 1950. Orien- tation film on the Bureau of the Census; historical background; types of informa- tion collected; methods employed; pur- poses for which used; how processed. Summary by Acting Director, Dr. Hauser. (38 frames, double, synchronized micro- groove disc, 10 minutes; also script) 5 Birds: Their Value to Agriculture U.S. Department of Agriculture, 1947. Life and habits of birds; their economic value due to insect diet; protective meas- ures; and emergency feeding. (61 frames: single; also double) 39 Blanking Sheet Metal on the Squar- ing Shear U.S. Office of Education, 1943. (Aircraft Work Series. Blanking Sheet Metal Work No. 1) Reviews material presented in