The audio-visual handbook (1942)

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32 The Audio-Visual Handbook almost every type are ready and anxious to co-operate with those schools which desire to teach the story of various products and commodities. Salt mining organizations provide exhibits of salt in the Photo Courtesy Hunter Colleyc Elementary School, New York City Picture Study various stages of manufacture, with illustrations of mining and refining methods; sugar refineries furnish charts of the processes involved in converting the juices of cane and beets to sugar; flour and cereal manufacturers distribute among schools booklets, charts, exhibits, and other materials dealing with the manufacture and use of their products. The same is true of almost any industry of importance — cotton, wool, forest products, mineral industries, fruit, fishing, silk, artificial silk, and many others. A brief list of some of the sources from which suitable exhibit materials and other classroom aids may be obtained will be found on page 209 of this publication. When writing to these firms for materials or information, it would be well to do so on the official stationery of