. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. MOTION. 411 Fig. moving them. There are no examples of the compound pulley in animal structures. We recognise the simple pulley in the trans- mission of the tendons of the peronei muscles through the groove of the external malleolus of the human ankle-joint, in the tendon of the obtu- rator internus gliding through the groove in the os ischii, in the tendon of the circumflexus palati passing through the hamular process of the sphenoid bone, in the tendon of the obliquus superior gliding through the ring attached to
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. MOTION. 411 Fig. moving them. There are no examples of the compound pulley in animal structures. We recognise the simple pulley in the trans- mission of the tendons of the peronei muscles through the groove of the external malleolus of the human ankle-joint, in the tendon of the obtu- rator internus gliding through the groove in the os ischii, in the tendon of the circumflexus palati passing through the hamular process of the sphenoid bone, in the tendon of the obliquus superior gliding through the ring attached to the frontal bone, and in several other instances where a change of the directions of the limbs results from tendons passing over joints, through grooves in bones, or under ligaments, by which the muscles are capable of producing effects on distant organs without disturbing the sym- metry of the body, an effect which, owing to the limited power of contraction in the muscles, could be accomplished in no other way. Of uniform motion.— If a body move constantly in the same manner, or if it pass over equal spaces in equal periods of time, its motion is uniform. The velocity of a body moving uniformly is measured by the space through which it passes in a given time.* The velocities generated or impressed on different masses by the same force are reci- procally as the ;)- Motion uniformly varied.—When the mo- tion of a body is uniformly accelerated, the space it passes through during any time what- ever is proportional io the square of the time. In the leaping, jumping, or springing, of animals in any direction, (except the vertical,) the paths they describe in their transit from one point to another in the plane of motion are pa- rabolic curves. The legs move by the force of gravity as a * Thus if v be the space passed over by the body in an unit of time, that space X by t, or t v will be the space s passes over in t units, that is, s = tv (1). t If a force communic
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