HORSESHOEING. 477 



firing-iron should be applied to cauterize the 

 crack from the coronet downward. Then the 

 crack should be cut away in the center, so as 

 to allow the use of an " expansion plate," as 

 shown in Plate No. 21. This expansion plate 

 can be made of brass or steel. It is composed 

 of four pieces, as follows : A plate divided in 

 the center into two equal parts, A and B (see 

 Plate No. 21), and a thread cut in the center. 

 Each part is made so as to fit dove-tailed into 

 the crack, held in place with a screw C, and a 

 burr D, underneath, to prevent the screw from 

 pressing the laminae of the foot. The screw, 

 which has considerable power as a lever, forces 

 the two plates apart, lifts up the wall of the 

 foot which is pressing each side of the crack, 

 and presses it outward. This being done, an 

 open shoe should be fitted, wider than the foot, 

 so as to expand it, which, together with the 

 notches cut in the groove under the coronet, 

 will cause a new and strong erowth from each 

 side of the crack, commencing at the coronet 

 and extending downward. 



