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246 U. S. GOVERNMENT FILMS 5372-1; 40 frames, color, synchronized disc, 10 minutes) 41 Flight Control Systems U.S. Department of the Navy, 1943. Operation of simple wire control system using stick and rubber pedals; torque tube systems; combinations of torque tubes and wires; push-pull tubes; wheel control in aircraft construction. Revision. (SN 1997; 49 frames) 41 Flight Instruments U.S. Department of the Navy, 1942. Operation of instruments relating to flight; their basic construction; common causes of faulty readings; compensa- tions required for altitude and tempera- ture factors. (SN 801; 91 frames) 7 Flower Gardens U.S. Department of Agriculture, 1938. Parade of informal, formal, and special gardens. (64 frames) 39 Flue Gas Analysis (Orsat Apparatus) U.S. Office of Education, 1944. (Engi- neering Series) Reviews material pre- sented in motion picture, same title. (OE 367; 43 frames) 41 Fly Density Surveys by the Grill Method U.S. Public Health Service, 1949. Re- views material presented in motion pic- ture, same title. (CDC-5-133; 28 frames, color) 27 Forced Landings U.S. Department of the Air Force [1943?] Common causes of forced land- ings; proper procedures to follow for forced landings under various conditions; how to establish a safe glide; secure field; and maneuver into best position. (FS 1-11; 71 frames) . 7 Forces in Flight U.S. Department of the Navy, 1942. How aerodynamic forces act on the wing in relation to control surfaces and center of gravity. (SN 807; 72 frames) 7 Fore Poppets and Internal Shoring Construction U.S. Department of the Navy, 1945. (Shipbuilding Skills Series. Preparation for Stern Launching) Reviews material presented in motion picture, same title. (SN 2341-m; 75 frames) 41 Forestry and Human Welfare U.S. Department of Agriculture, 1938. How forests contribute to the grazing of livestock and game, water supply, and recreation. (59 frames) 39 Forge Welding U.S. Office of Education, 1945. (Farm Work Series. Forging No. 2) Reviews material presented in motion picture, same title. (OE 192; 26 frames) 41 Forging With a Hand Forge U.S. Office of Education, 1945. (Farm Work Series. Forging No. 1) Reviews material presented in motion picture, same title. (OE 191; 48 frames) 41 Form Blocks and Forming U.S. Department of the Navy, 1942. How to shape metal with forming blocks; use dies for flanging, making hollows, and forming joggles. (SN 1037; 67 frames) 41 Forming on a Hand Operated Brake U.S. Office of Education, 1944. (Aircraft Work Series. Forming Sheet Metal No. 3) Reviews material presented in mo- tion picture, same title. (OE 134; 51 frames) 41 Forming on Rotary Machines U.S. Office of Education, 1945. (Aircraft Work Series. Forming Sheet Metal No.