240 



SCIENTIFIC HOKSESHOEIXG. 



1 



I 



il/\ 



B 



,Vv 



If A^ 



Fig. 131. double roller shoe. 

 A, A, Sole bearing of tlie .';lioe. 



Closely connected \vith the turntable slice described else- 

 where, and in chronic cases of anchylosis of the ankle joint, is 

 the rolling motion ball shoe illustrated in Fig. lol. The prac- 

 tical result is the freedom of motion it permits to all the joints 

 of the foot and limb, to compensate for the stiffness of the 

 joint afl'ected. This freedom of movement takes the strain 

 from the stiff joint and enables the horse to twist and turn to 

 find the necessary relief. The ground surface of the shoe is 

 solid metal, the center being the highest and gradually rolling 

 or curving to the wall on all sides. It is the shoe that the 

 late trainer of trotting horses, Ben Mace, used with great 

 benefit on Sensation in all of his successful trotting' races. 



