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292 U. S. GOVERNMENT FILMS Spray-Painting Equipment U.S. Department of the Navy, 1942. Function of typical paint-spraying outfit: spray gun; material containers; hose; air transformer; condenser; compressor. (SN 107; 60 frames) 41 Spray-Time U.S. Public Health Service, 1945. (Ma- laria Control Series) Several methods of malaria mosquito eradication with emphasis on residual spraying with DDT. Stresses family cooperation with spray program for successful home spraying. Photographs. (CDC-5-028; 83 frames, synchronized disc, 13 minutes) 27 Spread and Prevention of Trichinosis U.S. Department of the Army, 1948. Causes, effects and spread of trichinosis; precautionary measures from pigsty to dinner table to prevent and eradicate the disease. (SFS 8-111; ?? frames, syn- chronized disc, 20 minutes) 41 Spread and Prevention of Trichinosis U.S. Public Health Service, 1948. Life cycle of T. spiralis; prevalence and spread of trichinosis; symptoms of the disease; control measures; and, con- sumer preventive measures. Photographs, drawings and photomicrographs. (CDC- 5-090; 67 frames, synchronized disc, 12 minutes) 27 The Square Knot U.S. Coast Guard, 1941. Reviews ma- terial prev«ented in motion picture, same title. (26 frames) 41 Squeeze Riveting: Stationary and Portable Riveters U.S. Office of Education, 1945. (Aircraft Work Series. Assembling and Riveting No. 7) Reviews material presented in motion picture, same title. (OE 293; 36 frames) . 41 Squirrel-Cage Rotor Principles U.S. Office of Education, 1945. (Electri- cal Work Series. Electrical Machinery No. 3) Reviews material presented in motion picture, same title. (OE 385; 28 frames) 41 Staining Blood Films for Malaria Parasite Examination U.S. Public Health Service, 1947. (Ma- laria Control Series) How to stain thick and thin blood films for laboratory diag- nosis of malaria. Technique of preparing Giemsa, Wright-Giemsa, and Wright's blood stains. Photographs and titles. (CDC-5-072; 90 frames, color, synchro- nized disc, 14 minutes) 27 Standard Breeds of Poultry U.S. Department of Agriculture, 1940. Shows standard varieties of poultry, male and female, and parts of fowls; various breeds of geese, ducks, and turkeys. Re- vision. (48 frames) 39 Steam Engine Indicator U.S. Coast Guard, 1943. (Ship's Engines Series) How indicator works in dia- grams; how to interpret indicator; its value in detecting faulty engine per- formance. (76 frames) 41 Steam Turbine Construction U.S. Coast Guard, 1943. (Ship's Engines Series) Appearance of turbine installa- tion ; principles of impulse — and reaction- type turbine; how steam is injected at high velocity with only moderate heat loss as compared to reciprocating engine. (80 frames) 41 The Steel Rule U.S. Office of Education, 1943. (Machine Shop Work Series. Precision Measure- ment No. 1) Reviews material presented in motion picture, same title. (OE 1; 52 frames) . 41