. Motion picture electricity. asized that the whole of the alternating-currentwaves on both sides of the zero line is used. The twoupper curves in the diagram show the current waves ineach of the two anodes, and the resultant curve III rep-resents the rectified current flowing from the cathodes, 222 MOTION PICTURE ELECTRICITY Curve IV shows the impressed alternating current e. m. is evident that if the part of the wave below the zeroline were reversed, the resulting current would be a pul-sating direct current with each pulsation varying fromzero to a positive maximum. Such a current coul
. Motion picture electricity. asized that the whole of the alternating-currentwaves on both sides of the zero line is used. The twoupper curves in the diagram show the current waves ineach of the two anodes, and the resultant curve III rep-resents the rectified current flowing from the cathodes, 222 MOTION PICTURE ELECTRICITY Curve IV shows the impressed alternating current e. m. is evident that if the part of the wave below the zeroline were reversed, the resulting current would be a pul-sating direct current with each pulsation varying fromzero to a positive maximum. Such a current could not bemaintained by the rectifier, because as soon as the zerovalue was reached the negative electrode resistance of therectifier would be re-established and the circuit wouldbe broken. To avoid this condition, reactance is intro-duced into the circuit, which causes an elongation of cur-rent waves so that they overlap before reaching the zero Rectifier , ooflooMooooooo ?> 1 oooooooAoo ?? feo r— Auto - Transformer. Fig. 118 value. The overlapping of the rectified current wavesreduces the amplitude of the pulsations and produces acomparatively smooth direct current as shown in curve complete circuit of a type Ai rectifier outfit isshown in Figs. 118 and 119. The alternating currentsupply circuit is connected at A and C, which run to taps2 and 5 on an auto-transformer whose terminals 1 and 7are connected to the anode terminals of a rectifier the lower cathode terminal of the bulb the currentpasses through lead C to the lamp which is connected toD and C, and the circuit is completed through the lead D, MOTION PICTURE ELECTRICITY 223 and the relay to the middle point of the auto the lamp carbons together closes the follow-ing circuit: A. C. terminal C to tap 5, through auto trans-former to tap 4, through lead D to lamp, through lampto terminal C, through contacts of relay to tilting magnet,through tilting magnet to tap on lead A. This ex
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidmotionpictureele00hall
