. Motion picture electricity. iron, within which are clamped iron cores madeof thin sheets of soft iron or special magnetic steel. Thissoft iron core is so made that copper wire coils can bemounted on projections forming soft iron core pole pieceswhich do not hold or maintain any magnetism except atthe instant one of the rotating magnet poles passes by it. Upona main shaft is mounted a pulley and two or moremagnet poles which are always magnetically chargedwhen the machine is to generate current. By means of a pulley or direct connection to an engine 44 MOTION PICTURE ELECTRICITY or other sour
. Motion picture electricity. iron, within which are clamped iron cores madeof thin sheets of soft iron or special magnetic steel. Thissoft iron core is so made that copper wire coils can bemounted on projections forming soft iron core pole pieceswhich do not hold or maintain any magnetism except atthe instant one of the rotating magnet poles passes by it. Upona main shaft is mounted a pulley and two or moremagnet poles which are always magnetically chargedwhen the machine is to generate current. By means of a pulley or direct connection to an engine 44 MOTION PICTURE ELECTRICITY or other source of power, the shaft and the magnet polesare rotated at high speed acting magnetically upon thestationary soft iron cores, transmitting alternately northand south pole magnetism to the cores, thereby inducinga current to flow in the copper wire coils, which are con-nected to the terminals at the top of the generator throughwhich the current generated may be supplied to theswitchboard in the power house and then to the / ROTATINGMAGNET POLES COPPER WIRE COILS ON CORES PULLEY MAGNET FRAME GENERATOR BASE Fig. 13 If the generator illustrated in Fig. 13 operates at thespeed of 1,800 revolutions per minute, we find from therule that we should multiply the speed by the number ofrotating pole pieces, which in this case is 4, making thecalculation as follows: 1,800 X 4 pole pieces = 7,200 alternations perminute. If we wish to reduce this figure to cycles divide7,200 by 2, which equals 3,600, and divide this by 60 sec-onds, equals 60 cycles. In making the diagrammatical sketch, Fig. 13, I havenot attempted to make an actual representation of a gen-erator, but one which would plainly illustrate the differ-ent parts of the generator and their functions. You can MOTION PICTURE ELECTRICITY 45 understand, of course, that there may be any number ofpole-pieces and the design may be changed to suit theparticular ideas of the designer. It has been stated that the current leaves th
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidmotionpictureele00hall
