. The railroad and engineering journal . ed by Herr Zeuner, at Dresden, was exhibited atthe recent Internal Navigation Congress at Frankfort. Itwas specially designed for obtaining a profile of the bot-tom of the River Elbe, but might be applied with advan-tage in other places. The apparatus consists of an arm or girder of angle-iron, A B in fig. I, ending at A C in a curved point in-tended to slide along the bottom of the river. The otherend of the arm is fixed by means of a yoke to a horizontal 448 THE RAILROAD AND [October, 1891. shaft turning in bearings mounted on a boat. It will beseen t
. The railroad and engineering journal . ed by Herr Zeuner, at Dresden, was exhibited atthe recent Internal Navigation Congress at Frankfort. Itwas specially designed for obtaining a profile of the bot-tom of the River Elbe, but might be applied with advan-tage in other places. The apparatus consists of an arm or girder of angle-iron, A B in fig. I, ending at A C in a curved point in-tended to slide along the bottom of the river. The otherend of the arm is fixed by means of a yoke to a horizontal 448 THE RAILROAD AND [October, 1891. shaft turning in bearings mounted on a boat. It will beseen that as the boat moves whenever a change occurs inthe bottom, the curved end A Cwill rise or fall and willcause the shaft O to turn to a corresponding degree. On this shaft a flexible band D E \% rolled, which iskept in tension by means of a spring drum R. On thisband is mounted a holder carrying a pencil /, the point ofwhich traces, while the boat moves, upon a roll of paperwhich is gradually uiirolled by a uniform movement, the Fig. \ ig. 2. profile of the bottom, upon which the curved end of thearm slides. A second pencil fixed in a position, which is determinedat the commencement of the operation, traces on the rollof paper the line of depth—that is to say, the line corre-sponding to the surface of the water. Lastly, a third pencil held by a spring permits theoperator to mark, as the boat passes, the distances and otherpoints on its course. To explain the theory of the apparatus, the curved endA C oi the arm is a section of a circle, which has thepoint O for a center and O C for a radius. It followsthat C i^ = arc C C ; C N = arc C C : and C F-C N = arc C C. Now C F — C jV is the depth looked for. This depth is then equal to the arc described by the arm on the shaft O, when the long arm passes from the position O Cio O CO C multiplied by the ratio -——. But the aics described by the shaft O are equal to the horizontal displacementsof the flexible band ; that is, t
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
