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SECTION l-DOCUMENTARY, 16mm. FILMS
(d) POPULAR SCIENCE
513 Development of the Photographic Image 2 Reels
Demonstrates the making of emulsion and the "development" of exposed lilm, with animations showing the chemical reactions, and an exposition of the Trevelli theory of photosensitivity.
3037 Einstein's Theory of Relativity 2 Reels
An interesting and simple explanation of the elementary stages of the Einstein theor}^ demonstrating the relativity of motion, direction, size, speed and time measurements. The lilm contains man}' animated diagrams, made by the famous film cartoonist Max Fleischer.
3101 Hot Air Heating 1 Reel
Scenes, supplemented by animations, trace the development of heating methods from fireplace and stove to a modern hot air system in a large building.
3112 Compressed Air 1 Reel
Enumerates the principles underlying the compression of air and its practical applications to the Bessemer converter, railway air brakes, air-driven tools, and the fire engine.
3113 The Water Cycle 1 Reel
Graphic presentation of the continuous circulation of water, from earth to skj'' and back to earth. Examples of each stage in the C3xle are given.
3117 Purifying Water 1 Reel
Stresses the need for purifying water, and shows methods of aerating, filtering, disinfecting and testing a city's water supply.
3122 Atmospheric Pressure 1 Reel
Illustrations of unbalanced air pressure, including the well-known "Magdeburg" hemispheres demonstration. Atmospheric variations in pressure between valley and hill-top and between land and water are clearly represented.
Onkr bv Hitmbers. FOR PRICES SEE PAGE 3