. Railway mechanical engineer . ithin a reasonable space on the chart withoutsacrificing clearness in the diagrams for light trains. There areseparate recording pens for the push and pull, attached to therespective ends of tlie measuring spring. Since only one ofthem is working at a time the same space is reserved on thepaper for the ordinates of both. In case small leaks should occur in the dynamometer, forinstance in the pulling side, the two pistons, rigidly connectedwith eacli other hy means of yokes and two longitudinal rods,would move away from their central position. It might thenhappen
. Railway mechanical engineer . ithin a reasonable space on the chart withoutsacrificing clearness in the diagrams for light trains. There areseparate recording pens for the push and pull, attached to therespective ends of tlie measuring spring. Since only one ofthem is working at a time the same space is reserved on thepaper for the ordinates of both. In case small leaks should occur in the dynamometer, forinstance in the pulling side, the two pistons, rigidly connectedwith eacli other hy means of yokes and two longitudinal rods,would move away from their central position. It might thenhappen that, after a long period of pulling exertions, the rearpiston would come in touch with the cylinder end, making The operation of this apparatus is based on the variation inthe position of the instantaneous axis of rotation of a sphereabout 4 in. in diameter, resting firmly on two disks, the axes ofwhich are perpendicular to each other. One of these disks isturning at a constant rate, driven by a small 1/100-hp. direct ^JtJLJ-. Details of the Dynamometer and Recording iVIechanIsm further measurements impossible. A means of equalizationhas been provided which brings the pistons back to their originalpositions at the instant the slightest change from a pulling to abuffing action takes place. At this instant an intercepting valvewith two check valves produces a connection through a pipeline between the two cylinders, thus equalizing the pressure andpermitting the pistons to return to their central position. Thecheck valves close and the by-pass between the cylinders is cutoff as soon as the central position is reached. Oil is suppliedto that chamber which is increasing its volume from a reservoirunder atmospheric pressure; to properly fill all the pipe lines,cylinders and valves with oil before starting the tests, anothertank is provided which carries about 50 lb. pressure. The two buffers at the forward end of the car are connectedby means of an equalizing lever, the central piv
Size: 2004px × 1247px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
