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MOTION PICTURES 49 drill and tap blind holes in cast steel on a radial drill, using a jig with a loose drill bushing to locate the holes. Sup- plementary filmstrip, same title, also available. (OE 22; 19 minutes) 32, 41 Drilling, Boring, and Reaming Work Held in Chuck U.S. Office of Education, 1941. (Machine Shop Work Series. Operations on the Engine Lathe No. 4) Cutting a tapered hole in a forged gear blank, using the taper attachment; centering the piece in a chuck, rough-facing, drilling, taper- boring, and reaming. Supplementary film- strip, same title, also available. (OE 9; 11 minutes) 32, 41 Drilling, Tapping, Stub-Boring, and Reaming U.S. Office of Education, 1945. (Machine Shop Work Series. Operations on the Horizontal Boring Mill No. 6) How to drill and machine-tap a hole; use a core drill; use a stub-boring bar for rough- and finish-boring and counterboring; use an adjustable reamer and a floating reamer. Supplementary filmstrip, same title, also available. (OE 230; 22 min- utes) 32, 41 Drilling in Metal, Wood and Plastics U.S. Department of the Navy, 1942. Six basic drilling steps; how to lay out wood and plastics with drill press, elec- tric and hard drills. (MN 142; 21 min- utes) 7, 41 Drilling to a Layout and Spot-Facing Cast Iron U.S. Office of Education, 1942. (Machine Shop Work Series. Operations on the Drill Press. Radial Drill No. 2) How to drill to a layout and spot-face the underside of a valve body flange, using the radial drill. Supplementary filmstrip, same title, also available. (OE 23; 15 minutes) 32, 41 Drilling with Portable Drill Motors U.S. Office of Education, 1943. (Aircraft Work Series. Assembling and Riveting No. 3) How to use a portable electric drill motor; select a drill; check a drill for true running; and install and use a special attachment for drilling. Supple- mentary filmstrip, same title, also avail- able. (OE 138; 17 minutes) 32, 41 Drinking Water U.S. Department of the Navy, 1945. (Ten Commandments for Health Series) Mac Gillicuddy demonstrates how not to use canteen of water on a march; disas- trous results of drinking water from un- tested stream; importance of drinking only water, chlorinated or drawn from a lister bag. (MN 2808-c; 5 minutes) 41 Driving and Bucking Rivets U.S. Office of Education, 1943. (Aircraft Work Series. Assembling and Riveting No. 5) How to set up and adjust a rivet gun; drive and buck rivets; and how a riveter and a bucker work together as a team. Supplementary filmstrip, same title, also available. (OE 140; 18 minutes) 32, 41 Driving the Semi-Trailer U.S. Department of the Army, 1948. Checking procedure for safety or pro- tection of equipment; how to back trailer up to platform for loading or unloading. (TF 55-1478; 19 minutes) 41 Duck Farming U.S. Department of Agriculture, 1934. Ducks for market: Peking, Muscovy, Runner, and Mallard; brooding, feeding, and marketing methods; operation of large Long Island duck farm. (13 min- utes, silent) 32, 41 Duties of a Dental Technician U.S. Department of the Navy, 1944. Duties of dental technician as an aid to dentist, responsibilities in the lab-