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SILENT RENTAL FILMS
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16 ni/ni ]Vo. Subject
human body; explains the valvular action of the human heart.) N. Y. Exchange.
BR 104 How You See — 500 ft. (Animated diagrams and photography explain the theory of sight; principles common to the eye and to the combination of lens, diaphragm and sensitive plate of the camera.) N. Y. Exchange.
BR105 The Human Voice — 500 ft. (Excellent study, demonstrating the physiological functions of the nasal passage, wind-pipe, gullet, epiglottis, vocal cords, etc., in producing sound.) N. Y. Exchange.
CHEMISTRY
16 Ill/ill IVo. Subject
BR106 Coal — 256 ft. (Shows by means of animation and actual photography the formation of coal through the ages, the coal areas in this country, how it is mined and graded.) N. Y. Exchange.
BR107 Refining of Petroleum — 246 ft. (A complete story of the oil refinery and what takes place in the re fining of crude oil. Animated diagrams are used to advantage in showing cracking process.) N. Y. Exchange.
BR 108 Making Coal Gas and Coke — 250 ft. (The story of coke and coal gas told in an interesting fashion to give the pupil first'hand information on the operation of a modern gas plant.) N. Y. Exchange.
BR109 Iron — 250 ft. (The mining and refining of the ore, simply told, readily understandable. Anima' tion used to show the workings of the blast fuf nace — charging, blowing in of air, elimination of impurities, handling of slag, and molten iron.) N. Y. Exchange.
BRllO Steel — 112 ft. (Bessemer and open hearth process visualized by means of actual photography and animation. Shows principle of regenerative process. N. Y. Exchange.
NOTE: The footage of the Health and Hygiene and Chemistry Films are given in 35 m/m negative length. Rental rates are $1.50 per day per picture, $2.50 for two days, and $5.00 for five days. The above prints are available on outright purchase plan. Write for special catalog on "Science of Life" series.
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