8 



MOVEMENT 



one of the phases of reduplicated footsteps. The 

 third is that of a runner. The periods of contact 

 are short, and separated from one another by intervals 



Fig. 5. — Chronographic record of the periods of contact of the feet of a man executing 

 various paces. 



during which neither foot is in contact with the ground 

 — a period of suspension. The fourth tracing is one 

 of a man running at a greater speed, the periods of 

 contact are shorter and the intervals longer. 



Record of the Rise and Fall of the Four Feet of a 

 Horse in its Various Pace?. — For 

 some time past specialists gifted 

 with immense powers of observa- 

 tion have set themselves the task 

 of determining the real character 

 of the various paces of a horse 

 from observations on the se- 

 quence of the heat of the feet. 

 The use of the word heat im- 

 plies an attempt to recognize 

 from the sound of the footfalls 

 the sequence of the moment of 

 contact, the question of dura- 

 tion being neglected. Moreover, 

 the sense of hearing is above 

 all others capable of appreci- 

 ating intervals of time. The effect has been tried 



Fig. 6. — Special apparatus for 

 recording the contacts of a 

 horse's fe< t with the ground; 

 a transmitting tube effects a 

 commun cation between the 

 air chamber and the chrono- 

 graphic tambjur. 



