. American engineer and railroad journal . POSITION OF APPARATUSWHEN TRACK IS CLEAR llwadbs j 7WJM, Bwgr\ after the manner of the dogs of a chuck and pressed down intoa groove in the solid rod by springs. This groove is bevelledon the front edge so that the dogs can rise over and the pistonslip ahead when the throttle lever is locked should any excessivepressure be brought to bear against the piston head. Thesprings and dogs are, however, amply sufficient to maintainthe connection with any hand manipulation of the

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering