338 



AGRICULTURAL ENGINEERING 



which will engage the surface of the ground and give a thrust 

 directly across the line of draft. This arrangement, no 

 doubt, adds a little to the draft, but it adds much to the con- 

 venience of handling the team, especially on the harvester. 

 When three horses are to be hitched to an implement with 

 a tongue attached in the line of draft, much may be accom- 

 plished by crowding the two horses on one side of the tongue 



as closely together as pos- 



sible and putting the sin- 

 gle horse out as far as 

 possible. 



Fig. 218 shows an at- 

 tempt described in an 

 agricultural paper some 

 time ago as a successful 

 method of overcoming side 

 draft on a disk harrow 

 with two horses on one 

 side of the tongue and one 

 on the other. The chain pulls back precisely the same 

 amount that it pulls the one side of the disk harrow ahead. 



su/yxsea fche ovnrcty?x 



Fig. 218. A futile attempt to remove 

 side draft when the team is not placed 

 directly in front of the load. An offset 

 tongue should be used. 



QUESTIONS 



1. Why is it more important to study eveners now than formerly? 



2. How closely should horses work? 



3. Explain how the placement of the clevis holes of a doubletree 

 may influence the distribution of the load. 



4. Describe the construction of three-horse eveners. 



5. Explain how an evener may be arranged to hitch five or six 

 horses to a plow. 



6. Why are simple or plain eveners desirable? 



7. What is the best way to overcome side draft? 



8. Why is it not possible to remove side draft by running a chain 

 across a machine? 



