THE FARM SHOP 



29 



farm use at the cheapest possible price has resulted in 

 turning out thousands of grindstone frames that pos- 

 sess very little stability. 



Grindstones should be kept under cover; the best 

 stone will be injured by leaving it in the hot sun. The 



Figure 35. Grindstone. The speed of a grindstone varies with 

 the diameter of the stone. It should turn just fast enough to keep 

 a flow of water on the upper face surface. If the stone turns too 

 slow the water will run down ; if too fast, it will fly off. 



sun draws the moisture out of the upper side and 

 leaves the lower side damp and soft so that in use the 

 stone soon becomes flat sided. The wet side freezes in 

 winter, which is a disintegrating process. 



The best stones, with good care, will become uneven 

 in time. The remedy is to true them with a quarter- 



