ROAD BUILDING AND MAINTENANCE 505 



should be dragged once each way after every heavy rain. 

 This must be done while the soil is moist but not sticky. 



It is not necessary to employ the direct supervision of 

 skilled engineers for the maintenance and repair of earth 

 and gravel roads, providing the directions and suggestions 

 they lay down are carefully and intelligently followed. A 



The split-log drag at work on an Iowa road. 



difficult piece of construction or fixing of grades should, 

 however, always be carried out under the supervision of an 

 expert. 



TOPICS FOR INVESTIGATION 



1. What is the prevailing type of road in your local- 

 ity? How many miles of public roads in your school dis- 

 trict? In your county? 



2. What roads do you know which climb steep hills? 

 Can you devise a method by which you can measure the 



