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MOTION PICTURES 43 fense strategy, Antwerp X. (M 1286; 21 minutes) 41 Defesa contra Invasao U.S. Coordinator of Inter-American Af- fairs, 1943. Portuguese version of "De- fense Against Invasion." Spanish version "La Vacuna 0 Defensa Contra La In- vasion" also available. (12 minutes, color) 37 Dental Amalgam Failure Caused By Moisture Contamination U.S. National Bureau of Standards in cooperation with Research Council of the American Dental Association, 1948. How to prevent contamination in dental amalgam. (15 minutes, color) 9 Denture Resin U.S. National Bureau of Standards in cooperation with Research Council of the American Dental Association, 1949. How impurities, pressure, temperature, rate of curing, mold surfaces, and water content affect dimensional accuracy and stability of acrylic resin dentures. Den- ture-processing technics based on National Bureau of Standard's research. (78 min- utes, color) Derivation of Pascal's Law. Part 1 U.S. Department of the Navy, 1943. (Elementary Hydraulics Series) Impor- tance of hydraulic power aboard ship; proves oil lighter than water; explains density, pressure, and force and how to determine each in a given amount of fluid. (MN 1730-a; 16 minutes) 7, 41 Derivation of Pascal's Law. Part 2 U.S. Department of the Navy, 1943. (Elementary Hydraulics Series) Proves that liquids transfer force equally to all parts of container; explains operation of several types of pressure gauges; reviews Pascal's law. (MN 1730-b; 16 minutes) 7, 41 953321—51 4 Descriptive Geometry: Finding the Lines of Intersection Between Two Solids U.S. Department of the Navy, 1947. Geometric features of cones and cylin- ders; generating elements and elementary intersections; how draftsman locates lines of intersection on H, V, and S views of cone cylinder combination. (MN 5344-a; 22 minutes) 41 The Desert People U.S. Bureau of Indian Affairs, 1941. How Papago Indians live in Southern Arizona, using all available resources, even farming and raising cattle on the arid desert. (25 minutes, color) 34 Designing a Pattern for a Water- Cooled Motor Block U.S. Office of Education, 1945. (Precision Wood Machining Series. Problems in Patternmaking) How a patternmaker studies a drawing for a single-cylinder water-cooled motor block; visualizes the shape of the casting; plans the general shape of the pattern; checks on core support; and plans the core boxes. Sup- plementary filmstrip, same title, also available. (OE 337; 15 minutes) 32, 41 Designing Core Boxes for a Water- Cooled Motor Block U.S. Office of Education, 1945. (Precision Wood Machining Series. Problems in Patternmaking) How a patternmaker visualizes the water jacket, port cores, and the core in a mold; then designs the ram-up core and set-up core. Sup- plementary filmstrip, same title, also available. (OE 338; 12 minutes) 32, 41 A Destructive Invader U.S. Department of Agriculture, 1949. (White Pine Blister Rust Series) Value of white pine forests of eastern Washing- ton, Idaho, and Montana to logging, mill- ing, and manufacturing industries; nature and danger of blister rust disease; duties