Principles Underlying the Draft of the Horse. -iU'J 



PLOW EVEN ERS. fwc MORSE ABRCAST. 



FIG ^.Equalizers for horses 



622. Three-Horse Equalizer. There have been many 

 forms of 3-horse equalizers devised, but the straight bar in 

 which one horse pulls against two 



others is the simplest and gener- 

 ally the most effective. To make 

 this evener the holes should all be 

 as nearly in the same straight line 

 as possible, and if the work is to be 

 divided equally the hole for the 

 draft pin should be placed at of 

 the length of the evener from one 

 end. Fig. 238 represents a set of 

 three, four and five-horse equal- 

 izers, and Fig. 239 represents a 

 method of driving four horses 

 abreast. 



ooo rm. m j mi FlO. 239.- Ai luiim-inciit of lines 



623. The Tread Power. The for driving four horses abreast. 



tread power is a rolling end- 

 less inclined plane so arranged that its motion is trans- 

 ferred to a shaft which is made to revolve and drive a bolt. 

 One form is represented in the upper portion of Fig. 240, 

 and in the lower portion of the same figure are represented 

 two forms of treads, the level at the right and the inclined 

 at the left. The level tread has the advantage of permit- 

 ting the horse to travel with its feet more nearly in the 



