CHAPTER LII 



EVENERS 



The use of four- or five-horse teams, as now required for 

 many implements, introduces many perplexing problems in 

 connection with the hitch and the eveners for dividing the 

 work evenly among the animals. In addition to the increase 

 in the size of teams used with gang plows, disk harrows, drills, 

 harvesters, etc., the tongue truck and the complicated patent 

 evener have been introduced, which add to the difficulty of 

 understanding the mechanics involved. 



There is little difficulty in dividing the load equally 

 between the members of a two-horse team. The doubletree 

 may be of any reasonable length, depending on whether it 

 is desired to work the horses close together or to spread them. 

 To divide the work equally between two horses, the end 

 holes for attaching the singletrees should be equally distant 

 from the center hole. The wagon doubletree is usually 44 

 inches long, and the plow doubletree 30 inches. Large horses 

 cannot be worked as closely as smaller ones. It is undesir- 

 able to work horses too closely, as all are worried more or less 

 by not having sufficient room. 



The Placement of Holes. When the horse is pulling on 

 the end of an evener, his advantage or leverage is equal to 

 the perpendicular distance between the extended line of 

 draft and the line of resistance passing through the center 

 hole, or the fulcrum, of the evener. This is illustrated in 

 Fig. 214. If all the holes in the evener are in line, it makes 

 little difference whether or not it is kept at right angles to 

 the direction of movement. If the center hole is not in line 



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