. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . A A ZERO LINE CURRENT FROMANODE X ZERO LINE CURRENT FROMANODE Y FIG RESULTING RECTIFIEDCURRENT IN LEAD Z I DIAGRAM I IF M ERCURY VAPORRECTIFICATION, current flowing from the anode (x) tothe cathode is shown bj Fig. 4b. Tin- positive current passes from anodeX in the mercury, but cannot passthrough the vapor to anode V. Thenegative current parses from anode Y toMir mercury, bin like the positive current,n cannot pass through vapoi to anodeX. Thus the flow of this current is trom anode Y to the
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . A A ZERO LINE CURRENT FROMANODE X ZERO LINE CURRENT FROMANODE Y FIG RESULTING RECTIFIEDCURRENT IN LEAD Z I DIAGRAM I IF M ERCURY VAPORRECTIFICATION, current flowing from the anode (x) tothe cathode is shown bj Fig. 4b. Tin- positive current passes from anodeX in the mercury, but cannot passthrough the vapor to anode V. Thenegative current parses from anode Y toMir mercury, bin like the positive current,n cannot pass through vapoi to anodeX. Thus the flow of this current is trom anode Y to the mercury and outot the cathode lead in the same direc-tion as the current from the anode in reality the current is trans-posed above the zero line and the cur-rent flowing from anode Y is shown in4 C. It is practically a direct current,slightly fluctuating. By means of a reactj -AC Supply _110 or 220 V. Auto. FIG. S. DIAGRAM OF BATTERY CHARGING. ance connected in the outside circuit, thecurrents 4b and 4c are so changed thatthey overlap and there is resulting currentshown by Fig. 4d. The pulsations arevery slight and a comparatively smoothdirect current is obtained. A completecircuit of a mercury rectifier is shown byFig. S. A transformer as noted is usedto give the proper voltage. Before the rectifier begins to rectifythe alternating current there is a high re-sistance at the surface of the mercurywhich must be broken down so that thecurrent can pass. This surface resist-ance is called the cathode resistance andacts like an insulating film over the en-tire surface of the mercury. The filmmust be punctured before any currentcan pass. When once started, the currentwill continue to flow, meeting with prac-tically no resistance as long as the cur-rent is uninterrupted. Any interruptionof the current, however, even for thesmallest fraction of a second of time, petmits the catho
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