188 THE:OLIVER PLOW BOOK 



If the horses are hitched tandem a somewhat different 

 result takes place. That is, the center of power is an 

 imaginary point half-way between the tug staples on the 

 hames of the front team and the rear team. This 

 requires a different adjustment on the clevis of the plow 

 if the same depth of plowing is desired. When three 

 horses are hitched abreast it is obvious, on account of the 

 size of the horses and the narrow furrow being turned, 

 that the center of hitch cannot apply to the center of 

 draft of the plow. It must be moved to the left of the 

 clevis in order to give the horses an opportunity to work. 



