Minutes of Proceedings of the Institution of Civil Engineers Volume 32

Minutes of Proceedings of the Institution of Civil Engineers Volume 32

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1871 edition. Excerpt: ...and that the direction of motion was altered by the relative excess of upward pressure under the anterior edge; and a surface would require to be of specialised curvature in relation to its other proportions, in order that it should have an equal supporting pressure throughout, and should thus continue to descend on the air as an inclined plane. The 'boomerang, ' indeed, continued to do this approximately, but this was in virtue of its rapid rotation, which gave quasi-fixity to its axis; but the peculiar twist which the axis received under the gyroscopie principles which the circumstances called into play here also witnessed to the unequal distribution of the supporting pressure. Another practical illustration of the same condition was the well-established fact that a rudder, when mounted, as it was in some screw-ships, without the intervention of a stern-post and dead wood between it and the screw, was less powerful in its ' turning ' action than if hung to a stern-post in the usual way. In the latter case, when the helm was 'put over, ' a considerable lateral pressure was piled up, so to say, on the flat surface of the stern-post, and contributed materially to the whole turning power exerted. Perhaps a more striking indication of a distribution of fluid pressure on a curved surface, irreconcilable with the Author's hypothesis, was supplied by the primd faeie paradoxical curvatures into which sails often arranged themselves under the effect of wind, as was specially noticeable in jibs.. In these sails especially, many sailmakers, for reasons which it would be out of place to enter on here, out the canvas with an extravagant roundness or convexity of outline on the anterior edge of the triangle (or...show more

Product details

  • Paperback | 166 pages
  • 189 x 246 x 9mm | 308g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236789059
  • 9781236789051