Stone Roads. 



471 



Not only this, but when a \vai'm-l<.ad of stone is all 



in one place, leaving it for a man to >pread, it is certain 



to occur that all of the dust and line materials not rem 



by the screen will drop into the voids at the place where 



FIG. 224. View of surfacing crushed rock as left by the distributing cart on the 

 road. Tim watch, 2 inches in diameter, serv B ;i> a .-calf to .-how the size of 

 the rock fragments. 



the load was left and this will irivo rise to a spot more com- 

 d llian the balance of the road and hence when it comes 

 into service two ruts or depressions are liable to form one 

 on either side of the harder spot. 



