SHOEING. 



justment which was devised and patented a few years ago by a 

 horse-shoer in the upper part of New York City. But Mr. Roburg, 

 by giving more length to the spring, and simplifying its construc- 

 tion, makes it all that can be desired. 

 The spring is made of steel, the exact 

 proportion and adjustment of which is 

 shown in Fig. 522. The wall is first 

 weakened by sawing down slightly be- 

 tween the heel and frog, when the 

 spring is placed in position with so much 

 force given to it as may be thought 

 necessary to press the heels outward as 

 desired. The shoe is then nailed on 

 over it, as ordinarily done. The press- 

 ure is gradual and constant, and must 

 prove just the thing where both quar- FIG. 520. Shoe with spring for 

 ters will admit of equal pressure. But cure of Contraction. Copied 



i-i-i i i from the French. 



should one quarter be much more con- 

 tracted or unyielding than the other, it would not work so well, be- 

 cause the full pressure would then be thrown on the weaker quar- 

 ter. This is in part obviated by nailing the shoe well back on the 



quarter of the oppo- 

 site side, which would 

 prevent that side 

 from being acted 

 upon. 



It does not, how- 

 ever, and cannot be 

 made to give the re- 

 quisite power to open 

 the quarters back 

 and outward, should 

 the heels be drawn 

 sharply inward and forward, as shown in Fig. 573, as can be 

 very easily done by the method devised by myself. But this 

 method of treatment is so simple and good that I have thought it 

 advisable to give very careful drawings of it. This spring of 

 different sizes and strength, with all particulars, can be obtained 

 by addressing the patentee, Mr. Roburg. I also give illustrations 



FIG. 521. French method of shoeing after Lafosse. 

 A, B, C, D, and E show lines of adjustment. 



44 



