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SECTION I. (d) Popular Science (Cont.)
3176 Chemical Effects of Electricity 1 Reel
The action of two electrodes in an electrolytic bath is traced from its earliest history through modern battery manufacture and use, electrolysis, electroplating, and electrotyping, to the metallurgy of copper and aluminium.
3192 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.
3194 Induced Currents 1 Reel
Surveys the principle of electromagnetic induction 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.
3201 Fire Making 1 Reef
Demonstrates the dependence of fire upon fuel and oxygen ; shows pure oxygen supporting rapid combustion ; indicates the kindling points of various substances ; gives the history of matches, and depicts the making of modern matches.
3203 Energy from Sunlight 1 Reel
Explains the principle of a solar engine, the energy of sunlight, wind and falling water and shows how energy from sunlight stimulates plant growth, and is stored for future use in the form of wood and coal.
3207 The Behaviour of Light 1 Reel
Introduces the subject of light. Presents the ideas of transmission, shadows and eclipses. Explains the formation of images by plane, convex and concave mirrors. Demonstrates the cause of refraction. Illustrates dispersion of light, colour and the rainbow. (For continuation of this sub] ect , see 3223, 3225 and 3226) .
3212 Food and Growth 1 Reel
A feeding experiment witli white rats, actually carried out in a classroom, demonstrates the food value of milk as compared with coffee or
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