336 



HISTORY OF CHEONOPHOTOGBAPHY. 



ber of images of the athlete we might show all the successive positions 

 of the weight, which would then have been very numerous. The series 

 of these positions would have given the law of the motion impressed 



o 



on the projectile, and the acceleration would have given in its turn the 

 measure of the forces developed by the gymnast at each instant. 



We can even push the analysis of muscular action so far as to give, 

 in the successive pictures to scale, the positions of the skeleton within 



the subject, with the phases of extension and contraction of the prin- 

 cipal muscles, whose insertions upon the skeleton are, of course, 

 known. Fig. 42 contains such details. 



