3434 U.S. Government films (1954)

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MOTION PICTURES 83 search Branch and many State Highway Departments in accordance with Ameri- can Association of State Highway Offi- cials' standards. (110 minutes, color) Hill Towns of Guatemala U.S. Coordinator of Inter-American Af- fairs, 1942. (Guatemala Sketch Book Series No. 2) Market of Chichicastenan- go and a village on Lake Alitlan; In- dians' daily life, crafts, clothing, and age-old customs. (10 minutes, color} 32, 41 History of Lighter Than Air Rigid Airships U.S. Department of the Navy, 1946. Development of lighter than air craft. (MN 2722-d; 40 minutes) 14 Hit the Beach U.S. Department of the Army, 1950. Coverage of "Operation Miki" (Hawaiian for "readiness") joint Army-Navy rehear- sal maneuvers on Oahu, Hawaii, October 1949 with 2nd Infantry Division and Navy Task Force One. (M 7727; 18 min- utes) 12 Hobbing a Helical Gear, Two Cuts: Non differential Method U.S. Office of Education, 1945. (Machine Shop Work Series. Operations on the Gear Hobbing Machine No. 5) How to set up the change gears; adjust the swivel head to cut on the helix angle; set up the machine for the rough cut; and realign hob and gear teeth. Supple- mentary filmstrip, same title, also avail- able. (OE 235; 17 minutes) 32, 41 Hobbing a Spur Gear. Part 1: Set- ting Up the Change Gears U.S. Office of Education, 1945. (Machine Shop Work Series. Operations on the Gear Hobbing Machine No. 1) Selection of the hob; how to select change-gear combinations for speed, feed, and index; identify the correct gears; mount the change gears; adjust for backlash; and how the change-gear trains are inter- related. Supplementary filmstrip, same title, also available. (OE 231; 15 min- utes) 32, 41 Hobbing a Spur Gear. Part 2: Set- ting Up and Hobbing the Work U.S. Office of Education, 1945. (Machine Shop Work Series. Operations on the Gear Hobbing Machine No. 2) How to select and mount the hob; set the swivel head angle; choose and mount the fix- ture; lead the gear blanks; set up for depth of trial cut; and adjust for full depth of cut. Supplementary filmstrip, same title, also available. (OE 232; 24 minutes) 32, 41 Hobbing a Square Tooth Spline Shaft U.S. Office of Education, 1945. (Machine Shop Work Series. Operations on the Gear Hobbing Machine No. 3) How to change hob arbors; centralize the hob with the centering gage; mount the cen- ter-type fixture and the top adjustable center; use a driving dog in mounting the spline shaft blank; set up for the trial cut; and take full depth of cut. Supplementary filmstrip, same title, also available. (OE 233; 17 minutes) 32, 41 Hobbing a Worm Gear: Infeed Method U.S. Office of Education, 1945. (Machine Shop Work Series. Operations on the Gear Hobbing Machine No. 4) Angle at which to set the swivel head; how to calculate and adjust the height of the hob arbor; engage horizontal feed; centralize the hob; and cut to a center distance. Supplementary filmstrip, same title, also available. (OE 234; 18 min- utes) 32, 41 Hoffman Special U.S. Economic Cooperation Administra- tion, 1950. EGA Administrator Paul Hoff- man's farewell tour of many European countries participating in the Marshall Plan; France, Germany, Norway, Bel-