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FILMSTRIPS 291 Soldering U.S. Department of the Navy, 1941. How to prepare bit, soldering cables, termi- nals, splices and solder sheetmetal on air- planes; uses of solder, flux and soldering copper. Aircraft machine shop demon- stration film especially for turret school. (SN 1529; 72 frames) 41 Soldering Lugs and Splicing Stranded Conductors U.S. Office of Education, 1945. (Electri- cal Work Series. Wiring) Reviews ma- terial presented in motion picture, same title. (OE 371; 39 frames) 41 Soldering Practice U.S. Department of the Navy, 1942. Pro- cedures in the care and use of the solder- ing iron. Special film for turret school Revision. (SN 1530; 46 frames) 41 Solving Special Basic Problems U.S. Department of the Air Force, 1943. (Slide Rule Operation and Application No. 3) How to use slide rule to find squares, cubes, square roots and cube roots of numbers, area and circumfer- ence of a circle, reciprocals of numbers and the product of three numbers. (FS 1-438; 38 frames) 7 Some Methods of Estimating Milk Quality by Bacterial Tests U.S. Department of Agriculture, 1939. Three tests for estimating bacteria in milk and counting colonies; necessity of clean utensils and surroundings for high- quality milk. Revision. (49 frames) 39 Some Principles of Breeding Demon- strated with the Herediscope U.S. Department of Agriculture, 1942. Practical application of fundamental laws of heredity with the herediscope de- signed by R. R. Graves, Bureau of Dairy Industry. Revision. (40 frames) . 39 Southern Pines Pay U.S. Dpartment of Agriculture, 1940. How to turn idle land to profit by plant- ing pines for turpentine, timber, and other products; how to protect stands against fire. (50 frames) 39 Special Purpose Vacuum Tubes U.S. Department of the Navy, 1943. Ra- dio Technician Training Series) Con- struction, sizes, models, and multiple uses of various vacuum tubes. (SAT 1540-g; 75 frames, synchronized disc, 19 minutes) 41 Splicing a Wooden Spar U.S. Office of Education, 1945. (Aircraft Work Series. Aircraft Maintenance) Re- views material presented in motion pic- ture, same title. (OE 248; 45 frames) 41 Split-Phase Motor Principles U.S. Office of Education, 1945. (Electri- cal Work Series. Electrical Machinery No. 4) Reviews material presented in motion picture, same title. (OE 386; 48 frames) 41 Split-Phase Motor Rewinding U.S. Office of Education, 1945. (Electri- cal Work Series. Motor Maintenance and Repair No. 3) Reviews material pre- sented in motion picture, same title. (OE 394; 40 frames) 41 Spot Welding U.S. Office of Education, 1945. (Aircraft Work Series. Assembling and Riveting No. 9) Reviews material presented in motion picture, same title. (OE 295; 44 frames) 41 Spotting Immediate Training Needs U.S. Department of the Army, 1944. (On-the-Job-Supervision Series No. 2) How training employees in their jobs solves the problem of many errors. (SFS 80-3; ?? frames, synchronized disc, 15 minutes) . 41