. Animal mechanism: a treatise on terrestrial and aërial locomotion. Animal locomotion; Flight. WALKING. 117 walking; all the vertical oscillations of the pubis will be registered. But, in order that the experimental lever may receive and transmit faithfully the vertical oscillations which the pubis executes during the act of walking, the drum itself must be protected from these oscillations. For this purpose an instru- ment has been invented, composed of two horizontal arms, which turn on a centre. These arms can move only in a hori- zontal plane, situated at the height of the pubis of the pe
. Animal mechanism: a treatise on terrestrial and aërial locomotion. Animal locomotion; Flight. WALKING. 117 walking; all the vertical oscillations of the pubis will be registered. But, in order that the experimental lever may receive and transmit faithfully the vertical oscillations which the pubis executes during the act of walking, the drum itself must be protected from these oscillations. For this purpose an instru- ment has been invented, composed of two horizontal arms, which turn on a centre. These arms can move only in a hori- zontal plane, situated at the height of the pubis of the person under experiment; to one of these arms is fixed the experi- mental lever Fig. 22.—^The upper curves, one in full line, the other dotted, represent the phases of the impact and of the rise of the right and left foot. Reading the figure from left to right, each rise of the curve denotes the commence- ment of pressure: the upper horizontal part corresponds with the dura- tion of the pressure, and the descent with the rise of the foot. The lower horizontal part of the curve indicates that the corresponding foot is in the air. O Pv. Oscillations of the pubis from above downwards, that is vertically, O P^. Oscillations in a lateral direction, or hori- zontally. It is evident that two oscillations in the vertical direction correspond with a single 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 repre-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marey, Etienne-Jules, 1830-1904. New York, D. Appleton and co.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectflight, bookyear1874
