. Electric railway journal . nch outside of the center so that the100-ft. lengths are easily counted and it is not neces-sary to count all of the dots representing 10 ft., butonly those to the nearest 100-ft. mark. As the car moves along, the current in the track andthe current from the motor-generator set cause the volt-meter needles to deflect a certain amount, which is com-paratively constant, and which shows the difference ofpotential between the two brushes on a piece of un-broken rail. The current in the rails due to the opera-tion of the cars may be either added to or subtractedfrom tha
. Electric railway journal . nch outside of the center so that the100-ft. lengths are easily counted and it is not neces-sary to count all of the dots representing 10 ft., butonly those to the nearest 100-ft. mark. As the car moves along, the current in the track andthe current from the motor-generator set cause the volt-meter needles to deflect a certain amount, which is com-paratively constant, and which shows the difference ofpotential between the two brushes on a piece of un-broken rail. The current in the rails due to the opera-tion of the cars may be either added to or subtractedfrom that produced by the motor-generator set andoccasionally the latter should be cut out, by openingthe switch, in order to see in what direction the currentin the rails is flowing and its value. Record Paper Motor Driven In addition to the generator which is used forsupplying a heavy current at a very low voltage there isalso a smaller one supplying current at about thirtyvolts, which current is used for the paper drive and also,. Interior Arrangement and Location after passing through a make-and-break device of somesort, and through condensers, is used in recording thedifference of potential between the brushes on the side of this circuit is connected to the voltmeterneedles which swing over the paper and also over con-tacts which are underneath the paper. Between theends of the needles and the contacts below sparks aredrawn which puncture the paper, each needle making adotted line of little holes which are burnt in the paperand which show every swing of the needle and itsamount except in those cases where the drop is so greatthat the relays have to act to protect the those cases the little holes will run up to a peak atthe point where the relay cuts out, and on the pen lineunderneath the peak and near the edge of the paperwill be found a sharp jog, showing that the joint isopen. Although some cars have been operated with onlytwo men, a motorman and an opera
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
