TIME 



9 



of providing horses' legs with bells which emit 

 different notes as each foot touches the ground. All 

 of these experiments have left doubts as to the 

 exact rhythm of the various paces, doubts which 

 have only been cleared up by the application of 

 chronograph} 7 . The following method has been em- 

 ployed in this research : indiarubber balls stuffed with 

 hair are fixed under the hoofs of the horse, and kept 



Jig. 7.— Horse at a full trot. The point indicated on the chart corresponds to the 

 position of the horse represented in the figure. 



in position by calkins which screw into the metal of 

 the shoe. Each of these balls is in connection with a 

 long indiarubber tube which is fastened to the horse's 

 legs by flannel binders. These tubes communicate 

 with the recording apparatus. The latter is provided 

 with a tracing needle, and held in the hand of the 

 rider (Fig. 7). The pressure of the feet upon the 



