HIGHWAY CONSTRUCTION 



weighing not less than 50 pounds; and the bricks which sink below the 

 general level should be removed, sufficient sand being added to raise 

 the brick to the required level. After all objectionable brick have 

 been removed, the surface should be swept clean, then rolled with a 

 steam roller weighing from 3 to 6 tons. The object of rolling is to 

 bring the bricks to an unyielding bearing with a plane surface ; if this 

 is not done, the pavement will be rough and noisy and will lack dura- 



bility. The rolling should be first executed longitudinally, beginning 

 at the crown and working toward the gutter, taking care that each 

 return trip of the roller covers exactly the same area as the preceding 

 trip, so that the second passage may neutralize any careening of the 

 brick due to the first passage. 



The manner of laying brick at street intersections is shown in 

 Fig. 59. 



