The Aeronautical Annual Volume 2

The Aeronautical Annual Volume 2

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 edition. Excerpt: ...fur Flugtechniker und Luftscbiffer." 1895. W. H. Kuhl, 73 Jagerstrasse, Berlin W. NOTE.--Mr. Chanute not having yet had leisure to prepare the text to accompany his computations, has somewhat reluctantly consented to the present publication of this first part. He intends soon to follow it with the mathematical demonstration, and this may be published in a Supplement to the Annual.--Editor. HOW A BIRD SOARS. By Professor W1ll1am H. P1cker1ng, Of Harvard Observatory. By "soaring" is meant the upward spiral progress of a bird, without apparent muscular effort. This action may be observed in this part of the world to particular advantage, in the case of certain large hawks. The following explanation of the principle of soaring is extracted from an article which I published in "Science," 1889, p. 245, and is, I believe, the first description of the process which ascribes to gusts of wind their true influence in the production of the phenomenon: "Whenever there is a high wind, such as is undoubtedly required by a soaring bird, we know that the air pressure is not uniform, that the wind comes in gusts. Those familiar with mountain summits know that the same phenomena are observed in the upper atmosphere as at the surface of the ground. If we were travelling along with such a wind in a balloon, the gusts would not be so severe, but they would be of longer duration. A B "Imagine, now, a bird travelling from A to B, in the same direction as the wind, and with its mean velocity. When the wind is uniform, it seems to him that he is in a dead calm. When a gust comes, the wind seems to blow from A. It carries him along faster; and when it ceases the wind seems to blow from B. It therefore affects him precisely as if he more

Product details

  • Paperback | 50 pages
  • 189 x 246 x 3mm | 109g
  • United States
  • English
  • black & white illustrations
  • 1236502442
  • 9781236502445