. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. MOTION. 463 i. 251. Fig. 251 shows the consecutive positions of the leg during two siiccesssive steps. To render them more distinct they are divided into two groups. The \8Jigures of the Jirst group show all the positions through which the leg passes while the toe rests upon the ground. The 10 of the second show the successive positions during the time the body is carried forward by the swinging leg. The positions from 1 to 4 show that division of time of the Jirst when both legs are on the ground ; the figures 5 to 14 i
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. MOTION. 463 i. 251. Fig. 251 shows the consecutive positions of the leg during two siiccesssive steps. To render them more distinct they are divided into two groups. The \8Jigures of the Jirst group show all the positions through which the leg passes while the toe rests upon the ground. The 10 of the second show the successive positions during the time the body is carried forward by the swinging leg. The positions from 1 to 4 show that division of time of the Jirst when both legs are on the ground ; the figures 5 to 14 ijine the portion of time of the first step when one leg rests on the ground while the other swings; from 15 to 18, that division of the second step where both legs rest on the ground ; No. 19 to 28 show the portion of time when one leg swingx while the other rests on the step must have been = feet. In this 2000 case also the length of the leg was 34 inches, which gives inches for the length of the synchronous pendulum, and for the time of each half oscillation 0".357; hence the time of taking each step was longer than the time in which the leg was susceptible of swinging without muscular effort, as a pendulum, by about 0".093. The step is considered as commencing at the instant when the hindmost leg is raised from the ground. Let us then suppose the whole sole of the foot of the right leg, which is in advance of the left, to be in contact with the ground, upon which it acts as a fulcrum; the hip, knee, and ankle-joints to be in a state of partial flexion, and the line from the head of the femur to the ankle-joint to be vertical, as in fig. 251, No. 4. In this position, the right leg supports the whole weight of the trunk, and the left, being extended obliquely backwards, does not contribute to the support of the burthen. The flexed position of the right leg lowers the centre of gravity, and the effective portion of the force of extension, acting
Size: 1446px × 1727px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, booksubjectanatomy, booksubjectphysiology, booksubjectzoology
