460 



MOTION. 



also, depends on this height. When the centre 

 of gravity is most depressed, the swinging leg 

 must be placed on the ground in the vertical 

 position, instead of being suffered to pass be- 

 yond it, as it does in slow walking. In quick 

 walking the propelling leg acts more obliquely 

 on the trunk, which is more inclined, and 

 forced forwards more rapidly than in slow 

 walking. The time when both legs are on the 

 ground diminishes as the velocity increases, 

 and it vanishes altogether when the velocity is 

 at a maximum. 



TABLE 5. 



Measure of the velocity in quickest walking. 

 Space traversed 47 metre*. 



From this table we observe that the velocity 

 in quickest walking is at the rate of 2.608 

 metres, or about 7.897 feet per second. In 

 conducting their experiments the MM. Weber 

 found that the velocity was constant, whether 

 the power of the muscular system had been 

 renovated by repose, or exhausted by fatigue, 

 and therefore they concluded " that so long as 

 the muscles exert the general force necessary 

 to execute locomotion, the velocity depends 

 on the size of the legs and on external forces, 

 but not on the strength of the muscles." 



TABLE 6. 



Measures of military inarc/iing. 

 Space traversed 43.43 metres. 



TABLE 7. 



Measure of the time of vibration of tfie leg, 

 and of the shortest tune of a step in dif- 

 ferent persona. 



TABLE 8. 



Measure of the natural gait in walking 

 with different velocities on the entire sole 

 of the foot. 



Space traversed 43.43 metres. 



TABLE 9. 



Experiments on the time during which the leg 

 rests on the plane of position in various 

 degrees of velocity. 



