. The Street railway journal . BOND TESTING OUThIT Swivel Trolley Harp The Economic trolley harp, which is illustrated in the twoaccompanying cuts, is a harp which is arranged to be free to turnon a swivel so that the wheel can adapt itself to the direction ofthe wire on curves and turnouts. The arrangement of the swivel. THh ECONOMIC HARP can be easily seen l)y inspection ot the two engravings. It hasbeen demonstrated many times that a swi\el wdiich allows theli-olle\ wlieel to take the directir)n of the wire results in much

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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884