3434 U.S. Government films (1954)
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162 U. S. GOVERNMENT FILMS Rotating Magnetic Fields U.S. Office of Education, 1945. (Electrical Work Series. Electrical Machinery No. 2) Rotating magnetic field pattern; three-phase winding in a demonstration stator; factors that cause rotation of the magnetic field; construction of polyphase motors. Animation. Supplementary film- strip, same title, also available. (OE 384; 13 minutes) 32, 41 Rough Grinding: Flat Surfaces U.S. Department of the Navy with the cooperation of U.S. Office of Education, 1944. (Optical Craftsmanship Series) How to grind flat optical surfaces by hand method; blocking of prisms to planoplate; hand grinding; cleaning of mill; inspection; measurement; de- blocking; grinding of large pieces of optical glass; and edge grinding. (MN 2449-e; 30 minutes) 41 Rough Grinding: Spherical Surfaces U.S. Office of Education, with the co- operation of the U.S. Department of the Navy, 1944. (Optical Craftsmanship Series) Three methods of rough grinding lenses: by hand, pin-bar, and mechanical curvature generator. Hand grinding in detail: how to use job card; check tool curvature; handle lone blanks during hand grinding; check lens curvature; and clean grinding tool. Animation. Supple- mentary filmstrip, same title, also avail- able. (OE 180; 26 minutes) 32, 41 Rough Grinding by Pin-Bar: Spher- ical Surfaces U.S. Office of Education, with the co- operation of the U.S. Department of the Navy, 1944. How to use job card; select and adjust grinding tool; use abrasive; grind by pin-bar; clean grinding tool; and correct worn grinding tools. Anima- tion. Supplementary filmstrip, same title, also available. (OE 181; 19 minutes) 32, 41 Rough Grinding with a Curvature Generator: Spherical Surfaces U.S. Department of the Navy with the cooperation of U.S. Office of Education, 1944. (Optical Craftsmanship Series) Theory, function, and operation of curve generating diamond grinding wheel; necessary adjustments throughout pro- ceedings. (MN 2449-d; 19 minutes) 41 Rough Grinding with a Vertical Sur- face Grinder: Flat Surfaces U.S. Department of the Navy with the cooperation of U.S. Office of Education, 1944. (Optical Craftsmanship Series) How to grind flat surfaces to 1/10,000 inch tolerance by machine; block all surfaces with minimum of changes of position; importance of accurately milled jigs and sufficient coolant for successful grinding. (MN 2449-f; 26 minutes) 41 Rough Line-Boring U.S. Office of Education, 1945. (Machine Shop Work Series. Operations on the Horizontal Boring Mill No. 5) How to install the boring bar and cutters; bore, counterbore, and spot face holes; and reposition from one hole to another. Supplementary filmstrip, same title, also available. (OE 229; 19 minutes) 32, 41 Rough Turning Between Centers U.S. Office of Education, 1941. (Machine Shop Work Series. Operations on the Engine Lathe No. 1) How to set up an engine lathe; operate the controls; grind clearances on cutting tools; and rough- turn round bar stock to a specified di- ameter. Supplementary filmstrip, same title, also available. (OE 6; 15 minutes) 32, 41 Rough-Facing, Boring, and Turning a Shoulder U.S. Office of Education, 1942. (Machine Shop Work Series. Operations on the Vertical Boring Mill No. 2) How to set up a rough casting on a vertical turret lathe; face a flange and turn a shoulder with the sidehead turret; fare a flange