Catalogue of the National Film Library of Sixteen Millimeter Motion Pictures (1931)

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36 CLASS A — Popular Science and Natural History COURTESY TITLE REEL NO. The third reel shows how a microscope is assembled. Several unusual optical instruments are exhibited, including a refractometer and colorimeter and a keratometer. The use of lenses in photographic cameras, and projectors, both for "still" and motion pictures, is illustrated. Other commonly known optical instruments are also shown, such as opera glasses and telescopes. Microscopes for various industrial purposes are featured. Among these are the microscopes for testing the structure of metals, the chemical microscopes used for observing crystals and similar objects and the microscopes used by physicians and biologists for studying germs. The film closes with some interesting microscopic studies of the beating heart of an embryonic chick which has been in the incubator only fortyeight hours, the blood circulation in a tadpole's tail and the moving macrophages or large blood cells from a tissue culture. While distinctively scientific in character, this film is full of fascinating entertainment. 3 Reels Courtesy of KINNEAR PICTORIAL SERVICE 2006 OUR EARTH Our earth is constantly changing today — just as it has been changing for millions of years in the past. This film illustrates how these changes take place. Volcanoes are among the most spectacular of the forces which change the earth's structure. Some astonishing views of volcanoes in eruption are shown, making you wonder how the camera man escaped with his life. One scene shows the havoc wrought by earthquakes. Another depicts the devastating effects of floods. There are also several beautiful shots of enchanting waterfalls. Hot springs, geysers, glaciers, and ocean breakers are all pictured while at work remodelling Mother Earth's features. An interesting sequence shows the various instruments used for recording and predicting the weather. The scenic effects and the camera work in the film are truly notable. It has general appeal and is both interesting and instructive. 1 Reel Courtesy of WEBER BAKING COMPANY 2007 OUR FOUR-FOOTED HELPERS No other group of animals helps man as much as the hoofed animals do, especially that group of beasts known as ruminants or cud chewers. The commonest example is the cow. How the cow feeds is shown both in natural pictures and diagrams. The picture then carries us to India where the Zebu, a white-haired kind of cattle is used as a beast of burden. The water buffalo serves a similar purpose in other parts of Asia. Several other hollow horned cattle are shown, including the American bison, the gnu from South Africa, and the giraffe. Then there are hoofed animals without horns, including the camel, the dromedary, the alpaca and the llama. The picture closes with a remarkable scene showing the thousands of reindeer plunging into a wide river and swimming after the boat of a herdsman. An extremelv interesting and entertaining nature study. 1 Reel Use Your Projector at Parent-Teacher Meetings