Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 31
the copper the positive terminal. There are many other forms of batteries, for instancethe one used for electric bells, in which the elements aremade of zinc and carbon with a solution of salamoniacsurrounding the elements. You are undoubtedly ac-quainted with this form of battery, as it is… … Fig. 2 An electric power plant is usually composed of fourdistinct parts: (1) The boiler. (2) The steam engine. (3) The dynamo or electri generator. (4) The switchboard. The illustration shows in a simple way such an instal-lation without the switchboard. The D. C. electric generator produces…
Motion picture theaters · Electric lighting
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