. Electric railway gazette . on of the resistance of the smallone, but having the same number of turns, would,with the same current, produce the same the other hand, if you have a very large cur-rent at your disposal, as, for instance, in electriclight circuits, a single turn of very thick wirewould suffice. The ammeters in electric light andpower stations are frequently operated by solenoidsof but a single turn. The voltmeters, however,which are placed in shunt and intended to takebut a very small fraction of the current, are pur-posely made of many turns of fine wire, and there-t
. Electric railway gazette . on of the resistance of the smallone, but having the same number of turns, would,with the same current, produce the same the other hand, if you have a very large cur-rent at your disposal, as, for instance, in electriclight circuits, a single turn of very thick wirewould suffice. The ammeters in electric light andpower stations are frequently operated by solenoidsof but a single turn. The voltmeters, however,which are placed in shunt and intended to takebut a very small fraction of the current, are pur-posely made of many turns of fine wire, and there-tore of high resistance so that, while taking littlecurrent, they will have requisite strength. FLASHING AT THE the Editor of the Street Railway Gazette : A car which was running last weeii began toflash violently at the commutati r. I could notfind what was the matter, and therefore reportedit and was instructed to run the car into the carhouse. It has since gone to the reijair shop, but I ^-BRARE -DISC. ;COILS. the motor and brake magnets are put in serieswith about 18 ohms resistance, when the motorbuilds up and sends a current through the brakemagnets and resistance- When the controller isturned back to the off position it again trips aswitch and throws in the trolley current. Fig. 3shows the brake applied to a truck. As soon as the wheels stop revolving the motorceases to generate current, so that the slipping ofthe wheels is impossible. The stops are said to be * From the Electrical Engineer, New York, INNER FACE or MHSNET Figs. 1 and 2. Sperry Electric Brake have no means of finding out what the troublewas, because our superintendent will never answerquestions of this kind. If we ask him he tells us itis none of our business, and that he will attend toit. I am anxious to learn the business thoroughly,and to know the reason for things. Will you oialigeme by telling me what was the matter and how tocure it? W. L. B. is very unfortunate for the road w
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
