496 Farm Mechanics. 



resented in Fig. 235 the attachment at the hock joint is ar- 

 ranged so as to lengthen the power arm of the hock muscle 

 lever different amounts and thus demonstrate an increas- 

 ing draft when the strength of the muscle is maintained 

 constant. 



In fixing the attention upon the hock joint as influenc- 

 ing the draft of a horse it is not intended to convey the 

 idea that other features are not important or that they do 

 not vary in a marked degree in the different types ; for it 

 is true that the make-up of the whole body of the draft ani- 

 mal is notably different from that of the one built primar- 

 ily for speed, but the type of variation shown at the hock 

 joint runs through the whole framework. 



619. Attachment of the Traces to the Hames at the Shoul- 

 der. To enable a horse to utilize his full weight to the 

 best advantage in draft it is important that the attachment 

 of the traces at the collar should be as low as the comfort 

 of the animal and other conditions will permit. When 

 the traces are low at the shoulder there is less leverage for 

 the draft to raise the horse off his front feet and hence his 

 weight counts for more. For the same reason a horse low 

 on his feet and with a relatively long body has greater lev- 

 erage for his weight in draft. 



It will not do to so lengthen the hame strap above and 

 shorten that below as to bring the attachment of the traces 

 down upon the point of the shoulder, for then the heavy 

 pressure of the collar will irritate the shoulder and make 

 it sore. 



620. Two-Horse Evener. There are three typos of two- 

 horse equalizers or eveners in use on the farm: (1) where 

 the holes for the whiffletrees are in a line back of the hole 

 for the draft pin; (2) where the holes for the whiffletrees 

 are in a line in front of the draft pin; and (3) where all 

 three holes are in the same straight line. 



Each of these types of evener divide the work equally 



