HUMAN LOCOMOTION. 



49 



of the other limbs, may be seen at a glance. A description of this 

 apparatus, and its mode of operation, with the results that it gives 

 when applied to man, will first engage our attention. 



For the sake of clearness, the machine may be described as con- 



Fig. 1. Experimental Shoe, intended to show the Pressure of the Foot on the Ground, 



with its Duration and its Phases. 



sisting of two parts, one of which is applied to the limb, and is called 

 the experimental shoe, while the other is carried in the hand of the 

 operator, and is simply a registering instrument, connected with the 

 shoe by an India-rubber tube. The experimental shoe is made by 



Fig. 2. Disposition op a Bundle op Muscle between Two Pairs op Mtographical Clips 

 Clip No. 1 holds the electric excitators of the muscle. A wave is represented at the moment 

 when it has just crossed each of the clips. 



fixing under the sole of an ordinary shoe, with heated gutta-percha, a 

 strong sole of India-rubber about five-eighths of an inch thick. Within 

 this sole there is an air-chamber, which, in Fig. 1, is represented by 

 dotted lines. 



VOL. VI. 



