Complete Catalogue 8mm Kodascope Library of Motion Pictures (1936)

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24 SECTION I. (d) Popular Science (Cont.) ignition systems of single and multi-cylinder engines, and water and air cooling are shown. 83147 Refrigeration 1 Reel Demonstrates the ammonia compression system of ice making ; shows the manufacture of 'dry ice,' the harvesting of natural ice and ends with views of the construction of refrigerators. 83155 Frequency Curves 1 Reel Explains the nature of a statistical frequency distribution, and the reason why frequency curves must be considered as boundaries of an area. Illustrates the fact that the properties of a group of natural objects must usually be expressed as a frequency distribution. 83157 Steam Power 1 Reel Shows early steam engines and the improvements which made the steamboat possible. Explains simple steam engines, steam boilers and locomotives. 83165 Heat and Light from Electricity 1 Reel Clearl}' explains series and parallel circuits. Ohm's Law, the manufacture and use of conductors, insulators, lamps, arc furnaces and heating equipment. 83176 Chemical Effects of Electricity 1 Reel The action of two electrodes in an electrol^'tic bath is traced from its earliest history through modern battery manufacture and use, electrolysis electroplating, and electrotyping, to the metallurgy of copper and aluminium. 83192 Magnetic Effects of Electricity 1 Reel Includes magnetism and magnetic induction with their applications to the electromagnet, the electric bell, the ammeter, the voltmeter and the motor ; the theory of permanent magnetism and an explanation of terrestrial magnetism. 83194 Induced Currents 1 Reel Surveys the principle of electromagnetic induction as applied to commercial generators ; the conversion of alternating current into direct current ; the action of the commutator and the transformer and the principle on which the telephone works. Order by numbers. FOR PRICES SEE PAGE 3