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140 U. S. GOVERNMENT FILMS different types of high-altitude dress; and what happens in aerombolism and anoxia. (TF 1-313; 35 minutes) 7 Piloting: Surface. Parts 1 and 2 U.S. Department of the Navy, 1943. (Navigation Series) Importance of ac- curate piloting; use of the bearing circle, compass repeater, and alidade in securing bearings. (MN 83-h; 16 min- utes) 41 Pine Ways to Profit U.S. Department of Agriculture, 1935. New industrial uses of pine; improving yield and quality of trees for forest products; dangers of old custom of woods burning; making paper from pine pulp; and distilling turpentine. (20 minutes) 3, 32, 41 The Pioneer Bubble Sextant, Mark V: Air. Part 1 U.S. Department of the Navy, 1944. (Navigation Series) How to use pioneer bubble sextant with and without bubble horizon and without averaging device; optical and bubble horizon systems; how to read scale. (MN 83-ab; 15 minutes) 41 The Pioneer Bubble Sextant, Mark V: Air. Part 2: Averaging Device, Adjustments, and Practical Use U.S. Department of the Navy, 1944. (Navigation Series) How to use instru- ment with averaging device; necessary checks and adjustments; practical use for sun and star observations. (MN 83- ac; 15 minutes) 41 Pipe and Tube Manufacture U.S. Bureau of Mines in cooperation with United States Steel Corp., 1940. (The Making and Shaping of Steel Series) Converting hot billets into seam- less tubes and flatrolled-steel strips into butt-welded pipes; detailed animated diagram of cold drawing; testing, stor- ing, and transporting pipes; use in oil derrick. (15 minutes, silent) . 17 Pipe Fabrication with Jigs U.S. Office of Education, 1944. (Ship- building Skills Series. Pipefitting No. 7) Purpose of the jig; laying out and as- sembling targets for a jig; setting targets and hangers using a pipe section as a template; how to fabricate pipe on the jig. Supplementary filmstrip, same title, also available. (OE 122; 22 minutes) 32, 41 Piston and Liner Removal U.S. Department of the Navy, 1945. (Progressive Maintenance on the Gen- eral Motors 12-567A Diesel Engine Series. Disassembly) How to remove connecting rod bearing, fork rod piston assembly, blade rod piston assembly, and the opposite liners. (MN 3708-b; 12 minutes) 41 Pistons and Rods U.S. Department of the Navy, 1944. (Fairbanks Morse Diesel Engine Main- tenance Series. Model 38D8 1/8 O.P. Benchwork) How to disassemble, clean, inspect, and reassemble pistons and con- necting rods. (MN 3691-i; 17 minutes) 41 Pitch Buttoning and Blocking: Spherical Surfaces U.S. Office of Education, with the co- operation of the U.S. Department of the Navy, 1944. (Optical Craftsmanship Series) How to warm lenses and pitch for buttoning; apply pitch to warm lenses; fit form tool on lens surface; block lenses in metal sheet preparatory to fine grinding. Animation. Supplemen- tary filmstrip, same title, also available. (OE 182; 30 minutes) 32, 41 A Place For You U.S. Marine Corps, 1951. Answers to the six questions asked most often in Marine recruiting stations. Television film trailer. (1 minute) 15 Placing Sliding Ways U.S. Department of the Navy, 1944. (Shipbuilding Skills Series. Preparation