. Motion picture electricity. ttery usually composed of a glass jar in which is placed two metal elements like zinc and Fig- 1 copper, for instance, and the jar ACID 24 MOTION PICTURE ELECTRICITY is then partly filled with a fluid composed of sulphuricacid and water in some cases. The action of the acidupon the zinc causes a chemical change to take place,which generates a current flowing from the zinc to thecopper, but at the upper end of the electric element orelectrodes the current flows from the copper to the zinc,making the copper the positive terminal. There are many other forms of batter
. Motion picture electricity. ttery usually composed of a glass jar in which is placed two metal elements like zinc and Fig- 1 copper, for instance, and the jar ACID 24 MOTION PICTURE ELECTRICITY is then partly filled with a fluid composed of sulphuricacid and water in some cases. The action of the acidupon the zinc causes a chemical change to take place,which generates a current flowing from the zinc to thecopper, but at the upper end of the electric element orelectrodes the current flows from the copper to the zinc,making 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 extensivelyused for door bells, etc. As already stated, where a large quantity of power isrequired the chemical method is not practical, thereforea power plant like that illustrated in Fig. 2 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 electricity by re-volving its armature at high speed under the influence of MOTION PICTURE ELECTRICITY 25 the magnetism in the stationary magnetic pole pieces orfield, as it is usually called. Electric generators are now made in all sizes, fromthe smallest up to 10,000 , these large ones requir-ing engines approximating 20,000 From the generator the current is brought throughlarge copper conductors to a switchboard in the powerstation, where it is distributed over as many switches asrequired to circuits running to different parts of thetown or city. Upon the switchboard, which is usually made of mar-ble, there are mounted protective fuses or automatic cir-cu
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidmotionpictureele00hall
