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78 U. S. GOVERNMENT FILMS Habits and Characteristics of the Roof Rat U.S. Public Service, 1950. (Rodent Con- trol Series No. 3) The roof rat lives above ground, especially under roof eaves; climbs pipes and brick walls, runs along wires; is a pantry thief, fond of cereals. (M 37-c; 14 minutes) 27, 32, 41 Hacksaws U.S. Department of the Army, 1943 (Care and Use of Hand Tools Series No. 6) Hacksaws; proper and improper uses; various types of frames and their specific uses. (TF 9-2031; 18 minutes) 32, 41 "Hail, Alma Mater" U.S. Department of the Army, 1951. West Point choir singing "Hail Alma Mater" and "Army Blue" with back- ground scenes of West Point. (M 7805; 6 minutes) 12 Half a Chance U.S. Department of the Army, 1946. Orthopedic rehabilitation study primarily to assist amputees in personal psychologi- cal adjustments. Based on rehabilitation of Lt. Bert R. Shepard, USAAF. (M 1254; 10 minutes) 41 The Halifax Incident U.S. Department of the Navy, 1942. (Rules of the Nautical Road Series) How misinterpretation of ship's whistle caused Halifax incident; international rules; importance of taking bearings; definition of nautical terms, proper look- out; good seamanship, inevitable acci- dent and marine collision law. Animation throughout. (MN 202-a; 6 minutes) 41 Hamilton Constant Speed, Removal and Disassembly U.S. Department of the Air Force, 1942. (Airplane Propellers Series) How to remove Hamilton constant speed propel- ler from plane and disassemble it for inspection and repair; safety precautions, tools used and protection of shaft. (TF 1-286; 20 minutes) 7 Hamilton Hydromatic, Propeller In- stallation U.S. Department of the Air Force, 1942. (Airplane Propellers Series) How to put propeller on shaft, install distributor valve, oil seals, and retaining nut, and mount dome in place. (TF 1-455; 13 minutes) 7 Hamilton Hydromatic, Reassembly and Adjustment. Parts 1 and 2 U.S. Department of the Air Force, 1942, (Airplane Propellers Series) Reassembly of hub, blades, dome and distributor valve; tools, guide marks, permissible tolerances and tests for concentricity, balance, gear preload and operation under high oil pressure. (TF 1-454; 44 min- utes) 7 Hamilton Hydromatic, Servicing U.S. Department of the Air Force, 1942. (Airplane Propellers Series) Dismant- ling, cleaning and inspecting hydromatic propeller: washing of parts; magnetic inspection of ferrous parts, and inspec- tion of blades and distributor valve. (TF 1-453; 8 minutes) 7 Hamilton Hydromatic, Theory and Operation U.S. Department of the Air Force, 1942. (Airplane Propellers Series) Operations of crew chief and pilot in warming up, checking, taking off, climbing, cruising, emergency and practice feathering, land- ing, and stopping the Hamilton Hydro- matic propeller. Construction and mech- anism of variable pitch propeller in models, diagrams, and airplanes. (TF 1- 451; 17 minutes) 7, 32, 41 Hammers U.S. Department of the Army, 1943. (Care and Use of Hand Tools Series No. 4) Care and use of machinist's ball, straight and cross peen hammers, sledge