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MOTION PICTURES 179 The Square Knot U.S. Coast Guard, 1943. Defines the terms bight, standing part, and fall piece; and demonstrates how to form a square knot. (4 minutes) 41 Squeeze Riveting: Stationary and Portable Riveters U.S. Office of Education, 1945. (Aircraft Work. Assembling and Riveting No. 7) How to select correct rivet sets for stationary and portable squeezers; setup and use the stationary squeezer and the portable squeezer. Supplementary film- strip, same title, also available. (OE 293; 15 minutes) 32, 41 Squirrel-Cage Rotor Principles U.S. Office of Education, 1945. (Electrical Work Series. Electrical Machinery No. 3) Laws of magnetism and induced e.m.f.; electron flow in squirrel-cage rotor setting up magnetic poles which create torque; construction of squirrel- cage rotors. Animation. Supplementary filmstrip, same title, also available. (OE 385; 10 minutes) 32, 41 Stability U.S. Civil Aeronautics Administration in cooperation with Shell Oil Co., 1949. (How an Airplane Flies Series No. 5) How to achieve complete stability so airplane will tend to return to normal flight if pitched, rolled or yawed. (10 minutes) Stainless Steel U.S. Bureau of Mines in cooperation with Allegheny Ludlum Steel Corp., 1943. Cost of waste through rust and corrosion; resisting quality of stainless steel; making stainless steel. (29 min- utes) 17 Standard Rate Turns U.S. Department of the Air Force, 1942. (Instrument Flying and Landing Series) Use of Link Trainer to demonstrate pro- cedure for making standard rate turns. (TF 1-529; 12 minutes) . 7 Standing Waves on Transmission Lines U.S. Department of the Navy, 1945. (Radio Technician Training Series) Causes, results, and prevention of stand- ing waves in radio high frequency trans- mission lines. Animated diagrams; lab- oratory demonstrations; diverse analogies. (MN 1540-k; 23 minutes) 7,41 Star Identification U.S. Department of the Navy, 1943. (Navigation Series) Apparent movement of the stars across the sky; 23 basic navigation stars, including Duthe, Polaris, Arcturus, Spica, Regulus, Vega, Betel- guese, Sirius and several important con- stellations. (MN 83-f; 16 minutes) 7,41 Static Test U.S. Department of the Air Force, 1942. (Airplane Structures Series) Forms, kinds and purposes of static testing; laboratory methods used to test various component parts of aircraft against origi- nal specifications and design. (TF 1- 312; 12 minutes) 7, 32, 41 The Steel Rule U.S. Office of Education, 1941. (Machine Shop Work Series. Precision Measure- ment No. 1) How to read steel rules; use the flexible hook and rule-type depth gages and combination squares; and lay out holes with a combination square. Supplementary filmstrip, same title, also available. (OE 1; 14 minutes) 32, 41 Steel Town U.S. Office of War Information, Overseas Branch, 1945. The steel mills, the "blast furnaces, and lives of steel workers, illus- trated by the town of Youngstown, Ohio. (16 minutes) ... 32, 41