. American engineer and railroad journal . tact with the two cables. The bottom ofthe box is tilled with a solid paraffine and the other with aliquid paralline oil, which tends to preserve the only point wliere there would be the slightest possibilityof leaking would be down at the stuffing-box about thespindle which rises from the brush. This is carefully pro-tected by a specially designed .stuffing box, and experimentshave been made by which it is shown that there is no percepti-ble leakage, and it is claimed that the delicate instrumentswithin, in testing the current, do not
. American engineer and railroad journal . tact with the two cables. The bottom ofthe box is tilled with a solid paraffine and the other with aliquid paralline oil, which tends to preserve the only point wliere there would be the slightest possibilityof leaking would be down at the stuffing-box about thespindle which rises from the brush. This is carefully pro-tected by a specially designed .stuffing box, and experimentshave been made by which it is shown that there is no percepti-ble leakage, and it is claimed that the delicate instrumentswithin, in testing the current, do not indicate any loss what- ever. A test was recently made on this road in which theconduit was filled with mud and water to its surface ; the carran into this mixture, stopped and started again, and ran back-ward and forward, showing that there was an ample currentat all times for the movement of the car. The voltage at thetime showed about 300 at the starting-point. The road whichhas thus far been operated has, of course, been merely an ex-. SECTION OF DISTRIBUTINIJ BOX OF THE UNIVERSAL CONUUIT. perimental affair, but it is intended to make an application ofthe system very shortly to a road working under ordinaryconditions, and give the system a thorough trial through the winter. ^ ASBESTOS PIPE COVERING MATERIALS. In a communication made some time since to the MichiganEngineering Society, Mr. William E. Coolcy reported hisexperience with coverings for steam-pipes. As an instanceof the value of steam-pipe coverings, he cited the case of anelectric-lighting plant at Ann Arbor, where there was about60 ft. of 7-in. pipe connecting the boiler with the this pipe was first put up the steam at the further endfrom the boiler was tested to determine the amount of waterentrained, and the average of nine experiments gave percent, of moisture. A few months later, when the pipes hadbeen covered, the (juality of the steam was again tested, andthe average of five experiments
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
