82 FARM MECHANICS 



prevent slipping, soft wooden strips are nailed onto the 

 lags at the lower edges. Even incline tread blocks or 

 lags are also recommended for horses that are not shod 

 and for all animals with split hoofs. The traveling 

 apron of the power is placed on an incline and the 

 treads are carried around the two drums at the upper 

 and lower ends of the frame by means of endless 



6.6.B. 



Figure 107. Bull Tread Power. Treadmills have gone out of 

 fashion. Too much friction was the cause, but a mill like this is 

 valuable to exercise a pure bred bull. Some dairymen make him 

 pump water. 



chains. There is a governor attachment which regu- 

 lates the speed and prevents the machinery from "run- 

 ning away." 



The simplest governor is made on the two-ball gov- 

 ernor principle with weights on opposite levers. The 

 governor is attached to two opposite spokes in the fly- 

 wheel. As the speed increases the weights move out- 

 ward because of their centrifugal force. This motion 

 operates a brake lever to retard or stop the flywheel. 



