116 CONSTRUCTION 



2 or 3 inches of If -inch stone, which is wetted and rolled. 

 The surfacing consists of an inch of screenings thoroughly 

 wetted and rolled. Some engineers use a little earth binder 

 between the courses and even on top of the finished pave- 

 ment. 



The best water-bound broken-stone road soon ravels and 

 disintegrates if subjected to the destructive action of 

 rapidly moving automobiles unless special preventive 

 measures are resorted to. In order to protect roads already 

 built and construct new roads in a more durable manner, 

 the following methods are adopted: 



1. Sprinkling with Fresh Water. As carried on in the 

 past this has been very expensive and in municipal practice 

 has often cost over $500 per mile per annum. Mr. S. 

 Whinery, M. Am. Soc. C.E., strongly advocates the use of 

 water under improved conditions which he admits are 

 necessary to make this method a success. When the 

 watering is properly done he is of the opinion that the 

 wear from travel is no greater than when a light oil is 

 used. By properly watering the pavement he states that 

 raveling can be prevented. Furthermore there will be no 

 dust if the pavement is constantly moist. Mr. Whinery 

 advocates the use of power sprinklers instead of the old- 

 fashioned water wagons sprinklers which shall be driven 

 by power and which shall deliver the water under a con- 

 stant head regulated by a pump. The author is of the 

 opinion that Mr. Whinery's method of sprinkling would 

 be especially successful in parks where opportunities for 

 carrying on the work under the most favorable conditions 

 would be possible. Here in the park the sprinkling would 

 be done by an employe under the supervision of a foreman 

 or superintendent who would make it his business to see 

 that the work was carried on efficiently. 



