478 



Farm Mechanics. 



of this plan will come from the tendency of summer traffic 

 on the narrow earth road to go so persistently in one track 

 as to develop wheel and foot ways deep enough to prevent 

 surface drainage. The fact that the; stone road may come 

 into service when the ground is wet will only lessen the 

 tendency to develop the evil pointed out but not prevent 

 it. For winter service in cold climates it seems clear that 

 the earth road will be likely to ensure better sleighing. 



] DITCH T 



0TT. 



\ DITCH T 



I2FT 



#> 

 ..'* ^ 



If Foot 

 Earth Road J Path 



jj. > -8<V - -f-^rir>fljb -7ft- 



FIG. 229. Diagrams showing profiles of oartli and stone road combined 



596. Telford Foundation. When it is necessary to build 

 the road where the ground is soft then it may be best to 

 lay a foundation of larger stone as was the general practice 

 with the .Romans and with the English engineer, Telford, 

 whose name is now attached to this type of road founda- 

 tion. The paying blocks should be uniform in size, laid 

 in rows across the road after it has been given the proper 

 slope, the pieces breaking joints. The stones should not 



