Animal Mechanism; A Treatise on Terrestrial and Aerial Locomotion

Animal Mechanism; A Treatise on Terrestrial and Aerial Locomotion

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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. 1890 edition. Excerpt: ...invented, composed of two horizontal arms, which turn on a centre. These arms can move only in a horizontal plane, situated at the height of the pubis of the person under experiment; to oue of these arms is fixed the experimental lever drum. Fio. 22.--Tho upper curves, one in full line, the other dotted, represent the phases of the impact and of tho riso of the right and left foot, Reading the figure from left to right, each rise of the curve donotos the commencement of pressure: the upper horizontal part corresponds with the duration of the pressure, and the descent with the rise of tbe foot. Tho lower horizontal part of the curve indicates that the corresponding foot is in tho air.. 0 Pv. Oscillations of the puhis from aiwve downwards, that is vertically, O Pa. Oscillations in a lateral direction, or horizontally. It is evident that two oscillations in the vertical direction correspond with a singlo horizontal oscillation. The person who walks, follows during this time a circular path, pushing before him the arm of the instrument, to which is fixed the apparatus which is to experiment on the vertical oscillations of the pubis. We get thus the tracing represented by the line O Pv (fig. 22). It is seen that the pubis rises at the middle of the pressure exerted by each foot, and sinks at the instant when the weight of the body passes from one foot to the other. The real amplitude of these oscillations is about 14 millimetres, according to Mons. Carlet. This movement, however, varies with the length of the step; it increases with it, but this increase does not depend on the maxima of the curve being more elevated, but on its minima being lower. We may explain these phenomena very easily. When the body is about to quit the support of one...show more

Product details

  • Paperback | 88 pages
  • 189 x 246 x 5mm | 172g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236793994
  • 9781236793997