Mechanical Conditions of the Plow. 



197 



the ring of which the neck-yoke runs. It is an objection to this 

 method, that both teams are not obliged to do their fair equal 

 share of the work. 



The plan recommended by Mr. Stephens obviates this difficulty, 

 and compels each horse to take his proper proportion of the load. 



It is represented in Fig. 105, where a is the bridle of the plow, 

 with its swivel hook. A pully, 6, of cast iron, six inches in 

 diameter, mounted in an iron frame, of which an edge view is 

 given in m, is attached to the hook of the bridle. A link-chain, c, 

 is rove through the frame of the pulley, and to one end of it the 

 short end is hooked; the evener, cZ, is hooked to a set of whiffle 

 trees for the plow horses. The other end of the chain passes 

 forward to a sufficient distance to allow the leading horses room 

 to work, and to it is hooked the second evener at e, for the leaders. 

 In the figure, a part of the chain, from/ to g, is broken off; but 

 the full length is about eleven feet. In this arrangement the 



