151 



MOVEMENT 



of downward pressure of the foot. It is found to be 

 twelve. It is clear, then, that the dynamographic 

 tracing, taken as a whole, corresponds to this total 

 period occupied by the leg in its phase of downward 



Fig. I03.-Geometrical chronophotocraph of the movements of the leg in walking, 

 during the period that the foot is in contact with the ground. 



pressure, so we must divide the abscissa of this curve 

 into twelve equal parts. If we draw the twelve cor- 

 responding ordinates, each of them will express the 

 vertical force exercised by the foot on the ground for 



^ 



Fig. 104.— Dynamographic tracing to express the phases of pressure hy the 

 foot on the ground in walking. 



the corresponding position of the leg. If these two 

 sets of figures are correspondingly numbered in the 

 tracings, comparison is greatly facilitated. 



One can, if so desired, dispense with the dynamo- 



