Archive image from page 478 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 MOTION. 465 sive ; that is, it swings forwards by the force of gravity alone, independently of muscular ac- tion. The supporting leg is regarded by the Messrs. Weber as a substitute for the pro- pelling weight of a clock, and the swinging leg as the substitute for the pendulum, both ex- changing their offices alternately. The distance from the point where the ball of the foot of the swinging leg quits to the point where it is again placed on the earth, is equa
Archive image from page 478 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 MOTION. 465 sive ; that is, it swings forwards by the force of gravity alone, independently of muscular ac- tion. The supporting leg is regarded by the Messrs. Weber as a substitute for the pro- pelling weight of a clock, and the swinging leg as the substitute for the pendulum, both ex- changing their offices alternately. The distance from the point where the ball of the foot of the swinging leg quits to the point where it is again placed on the earth, is equal to the length of a double .step. This outline of the action of the legs in walking depends on principles which we shall now proceed to investigate more strictly, in doing which we shall draw largely from the theoretical and experimental researches of the Messrs. Weber, whose labours have con- tributed so extensively to advance our know- ledge in this interesting branch of human phy- siology. The positions of the body in walking at va- rious instants of time have been described both by Borelli and Weber; it is thus represented by the latter. Let Jig. 253 be the vertical, and Jig. 254 the ground plan, on planes in a straight Fig. 253. ctt Fig. 254. , 134&6 ao horizontal path. In Jig. 253 the simultaneous positions of the two feet are represented at the moment when they reach ' the ground, also the position of the centre of gravity of the body in the vertical plane. The position of the right leg is shown by the continued lines, and that of the left leg by the dotted lines. The extremity of the right foot is designated by the letter a, that of the left by the letter b, and the centre of gravity by r, the contemporaneous positions of these points being denoted by the numerals annexed to these letters. In the horizontal projection,-. 254 represents the si- multaneous position ot both legs and of the cen- tre of gravity : the letters and figures are the same as in the pre
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