470 



Farm Mechanics. 



form or which binds as well and sets as quickly. It is 

 readily quarried and put in shape for the crusher ; and the 

 power required for crushing being small makes it less bur- 

 densome for towns to invest in the necessary machinery. 



It is true that the road wears rapidly under heavy traffic 

 and the surface becomes dusty in a dry time, but not more 

 so than clay roads do. It- is true that careful road engi- 

 neers advise against its use, but it is usually from the stand- 

 point of city and suburban traffic rather than from that of 

 the purely country road. 



FIG. 223. View of distributing cart spreading crushed rock on the road. 



586. Spreading the Rock on the Road-bed, It is import- 

 ant that the crushed rock should be laid down on the road- 

 bed in a sheet both of uniform thickness and uniform den- 

 sity and where this is not done the road is quite certain to 

 roll to an uneven surface which will make it necessary to 

 add more material in some places and remove it in others. 

 But this will unnecessarily add to the cost of the road. 



