. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. 5*2 PHYSIOLOGICAL PHYSICS. [Chap. XLIII. of the toes. At this instant the leg behind begins the advance by giving the body an impulse forwards from its point of sup- port. The force acts in the direction J'F. Let GF represent the intensity of the force. If a parallelogram be constructed, of which GF is the diagonal, the force GF is evidently resolvable into GV, an upward force acting against gravity, and neutralised by it and a force
. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. 5*2 PHYSIOLOGICAL PHYSICS. [Chap. XLIII. of the toes. At this instant the leg behind begins the advance by giving the body an impulse forwards from its point of sup- port. The force acts in the direction J'F. Let GF represent the intensity of the force. If a parallelogram be constructed, of which GF is the diagonal, the force GF is evidently resolvable into GV, an upward force acting against gravity, and neutralised by it and a force GH, which is the part of the impulse- that d eter mines the forward movement. If the upward movement GV is quite neutralised by the downward force of gravity, the body will simply be ad- vanced in a horizontal line, and it is found, as a fact, that up and. }' L > Fig. 218.—The Dynamics of Walking. down oscillations of the body are of very small amount. To give the forward impulse, the leg that is behind is extended, and in continuation of that action the heel is raised from the ground by the extension of the ankle joint, till the leg rests on the ground by the tip of the toes only (Fig. 219, 1, hkfm). By this exten- sion the leg finally leaves the ground, as represented by the thin line of 3. Meanwhile, to permit the exten- sion referred to, the forward leg is slightly bent at the. 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 M'Gregor-Robertson, J. (Joseph), 1858-1925. Philadelphia, H. C. Lea's son & co.
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