110 



FARM MECHANICS 



Figure 122. Post Pump Jack. This arrangement is used in fac- 

 tories when floor space is valuable. The wide-face driving-pulley is 

 shown to the left. 



Figure 123. Three Jacks for Different Purposes. At the left is a 

 reverse motion jack having the same speed turning either right or 

 left. The little jack in the center is for light work at high belt 

 speed. To the right is a powerful jack intended for slow speeds 

 such as hoisting or elevating grain. 



morning. This may not be less expensive than pump- 

 ing the water directly, but it offers the advantage of 

 water fresh from the well. Pure air pumped into the 

 well tends to keep the water from becoming stale. 



