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MOTION PICTURES 75 Supplementary filmstrip, same title, also available. (OE 220; 14 minutes) 32, 41 Grinding a Parallel Bar. Part 2: Grinding Operations U.S. Office of Education, 1945. (Machine Shop Work Series. Operations on the Surface Grinder No. 2) How to position the parallel bar on the chuck; rough- grind the opposite sides of the bar; rough-grind adjacent sides of the bar at exact right angles; and finish-grind all four sides. Supplementary filmstrip, same title, also available. (OE 221; 15 min- utes) 32, 41 Grinding a Plain Pin. Part 1: The Grinding Wheel U.S. Office of Education, 1944. (Machine Shop Work Series. Operations on the Center-type Grinder No. 1) Cutting ac- tion of a grinding wheel; how to select the correct grinding wheel; handle and mount the wheel on the collet; and true and balance the wheel. Supplementary filmstrip, same title, also available. (OE 80; 17 minutes) 32, 41 Grinding a Plain Pin. Part 2: Grind- ing Operations U.S. Office of Education, 1944. (Machine Shop Work Series. Operations on the Center-type Grinder No. 2) How to lubri- cate and set up a center-type grinder; mount and adjust the workpiece for proper tension between centers; set the table reversing dogs; and roughgrind a plain pin. Supplementary filmstrip, same title, also available. (OE 81; 17 minutes) 32, 41 Grinding a Slender Shaft With a Back Rest U.S. Office of Education, 1944. (Machine Shop Work Series. Operations on the Center-type Grinder No. 3) How to select and set up a back rest; adjust the back rest during grinding; rough- and finish- grind the long shaft; and check and adjust the taper. Supplementary filmstrip, 953821—51 6 same title, also available. (OE 82; 17 minutes) 32, 41 Grinding a Straight Hole U.S. Office of Education, 1944. (Machine Shop Work Series. Operations on the Internal Grinder No. 1) How to use a universal chuck; select the proper grind- ing wheel and adjust the wheel speed; set the length of the stroke; set the cross- feed for automatic grinding; and use the precision cross-feed for finishing grinding. Supplementary filmstrip, same title, also available. (OE 77; 18 minutes) 32, 41 Grinding a Taper U.S. Office of Education, 1944. (Machine Shop Work Series. Operations on the Center-type Grinder No. 5) How to pre- pare an arbor for grinding; mount and adjust the arbor between centers; adjust the swivel table and taper scale; rough- and finish-grind the taper; and check the taper ring gage and light gage. Sup- plementary filmstrip, same title, also available. (OE 84; 19 minutes) 32, 41 Grinding a Template U.S. Office of Education, 1945. (Machine Shop Work Series. Operations on the Surface Grinder No. 3) How to mount and true the wheel; mount the sine bar on the table; set the sine bar for specified angles; set up the template on the sine bar; rough- and finish-grind the template; and check the workpiece for accuracy. Supplementary filmstrip, same title, also available. (OE 222; 15 minutes) 32, 41 Grinding a V Block U.S. Office of Education, 1945. (Machine Shop Work Series. Operations on the Surface Grinder No. 4) How to set up a V block to grind the ends and the V; rough- and finish-grind the ends; estab- lish reference points for grinding the V to precision dimensions; and check the work for accuracy. Supplementary film-