126 SCIENCE OF SUCCESSFUL THRESHING. 



The hole or holes should be dug before the engine is un- 

 coupled or the team unhitched, so that if not level, machine 

 may be pulled out, the holes changed and the machine backed 

 into them. When the machine is high in front, it can be 

 quickly leveled, after engine or team has been removed, by 

 cramping the front axle, digging iri front of one wheel and 

 behind the other, so that wheels will drop into the holes 

 when pole is brought around square. 



With geared machines "bolster- jacks" are used to keep 

 the "side-gear" from twisting front end of machine out of 

 level. The hind axle being level, place the bolster-jacks in 

 position, and screw them up so as to level the front of ma- 

 chine. It is not necessary to have the front axle level, as 

 the bolster- jacks will accommodate themselves to it. 



Place a block in front of the right hind wheel to prevent 

 the machine from being drawn forward by the belt. This 

 block should be carried with the machine, so as to be handy 

 when needed. 



When pulling the machine out of holes, starting it on 

 soft ground or on a hill, cramp the team around to one side, 

 and it will move the load with about half the effort necessary 

 to start straight ahead. In cramping the front axle, but one 

 of the hind wheels starts at a time. 



Setting with Reference to the Wind. The thresherman 

 cannot always choose the direction in which to set the ma- 

 chine, but when he can, he should select a position -in which 

 the wind will be blowing in the same general directions as 



