titonc Roads. 



469 



the bottom so as to completely iill the v>i.U. There is tin- 

 still further danger that it will work in hetween the flat 

 surfaces of the crushed rock, holding them apart to such an 

 extent that heavy loads will produce too much rocking of 

 the pieces and quickly lead to the formation of ruts. If 

 the loam could be had in a dry condition, such as is usually. 

 the ease with the screenings and the sand, it would be possi- 

 ble with dry rolling to nearly completely fill the voids so 

 that the subsequent use of water would, with the roller, lead 

 to good results. 



585. Limestone for Stone Roads. There is no doubt that 

 crushed limestone although a soft rock will make an excel- 



Fm. 222. View of distributing cart being raised to spread crushed rock. 



lent country road when' tin 1 traffic is not heavy and the 

 use of it should be encouraged wherever suitable quality of 

 rock is available. There is no rock which breaks in better 

 30 



