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48 U. S. GOVERNMENT FILMS Double Carrick Bend U.S. Coast Guard, 1943. Why double car- rick is commonly used to pin two hawsers and how to tie. (3 minutes) 41 Double Ram Vertical Surface Broach- ing U.S. Office of Education, 1945. (Machine Shop Work Series. Operations On a Broaching Machine No. 3) How to as- semble broaching inserts; mount and adjust the work fixtures; set trip dogs for the ram stroke; measure the work- piece after trial broaching; and surface- broach at a production rate. Supplemen- tary filmstrip, same title, also available. (OE 238; 30 minutes) 32, 41 Double Your Money From Traps U.S. Bureau of Indian Affairs, 1949. How, when and why to trap in proper season; how to skin muskrat and beaver; role trapper plays in fur industry. (20 min- utes, color) 34 Down Where North Begins U.S. Coordinator of Inter-American Af- fairs, 1943. Geographic, economic, and social aspects of Ecuador: mountains, jungles, Riobamba, and Quito; farms, Indian handicrafts, volcanoes; pre-Inca and Inca ruins. (22 minutes, color) 32, 41 Drafts and Slings U.S. Department of the Army, 1943. (Military Stevedoring Series No. 4) How to use sling or cargo net pallet sling, and pie plate in handling cargo from docks and warehouses to holds. (TF 55-1117; 16 minutes) 41 Drag U.S. Civil Aeronautics Administration in cooperation with Shell Oil Co., 1949. How streamlining and small frontal area mini- mizes "parasite" drag and long narrow wings cut down "induced drag". How "skin friction" operates. (15 minutes) Drainage U.S. Department of the Army, 1943. (Military Roads Series No. 2) Impor- tance of drainage; providing necessary crown. Methods of constructing ditches, open and covered culverts. (TF 5-1194; 11 minutes) 41 The Drama of Steel U.S. Bureau of Mines in cooperation with the Inland Steel Co., 1946. Uses of steel; historic and modern production methods; modern open pit mining and furnaces; open hearth in animation; processes in various types of mills, bloom- ing, cold reduction, tin, billet, and bar mills. (34 minutes) 17 Drawing, Stretching, and Stamping U.S. Bureau of Mines in cooperation with Aluminum Co. of America, 1944. (How To Form Aluminum Series) Tech- niques of sheet-metal working; properties of aluminum alloys; purpose of heat- treating and refrigerating metals; selec- tion of metal and use of tools. (22 min- utes) 17 The Drill Press U.S. Office of Education, 1945. (Machine Shop Work Series. Basic Machines) Functions, characteristics, and basic op- erations of the drill press. Supplementary filmstrip, same title, also available. (OE 71; 10 minutes) 32, 41 Drilling a Hole in a Pin U.S. Office of Education, 1942. (Machine Shop Work Series. Operations on the Drill Press. Sensitive Drill No. 1) How to lay out two holes at each end of a short 1% inch diameter pin; and drill the holes on the sensitive drill press. Supplementary filmstrip, same title, also available. (OE 46; 10 minutes) 32, 41 Drilling and Tapping Cast Steel U.S. Office of Education, 1942. (Machine Shop Work Series. Operations on the Drill Press. Radial Drill No. 1) How to