144 



MOVEMENT 



instantaneous views of two men fencing; both sets 

 of combatants represented belonged to the Italian 

 school. 



Geometrical photographs sometimes elucidate ex- 

 tremely complicated movements. Thus, in jumping 

 from a height (Fig. 96), the position of each point of 

 the body, in its various phases of movement, is 

 expressed by an almost continuous curve. The axes 

 of the long bones make the figures more or less com 

 plicated, revealing movements the existence of which 

 would never have been suspected from mere ocular 



Fig. 98.— Oscillations of the leg in running. (Geometrical chronophotograph.) 



observation. In jumping from a height, the difference 

 between landing gently with no shock and landing 

 with rigid legs is clearly seen by comparing Fig. 96 

 with Fig. 97. The latter corresponds to the drop with 

 stiffened legs, namely, in which the shock is not 

 broken by flexion of the legs. 



In complicated actions, a diagram can be obtained 

 of only one part of a movement ; for instance, in 

 running it may only be necessary to observe the phases 

 of oscillation of the legs — this can be done by limiting 



