ROADS AND BRIDGES 



329 



Cross Section Roman .Road (Appia-n M/ay). 



Crost Section French Road (ftoman met/tod) 

 crev/ous io /77S. 



Cross Section of Tresauguet road. /77S. 



Cross Section Ti'/foro 1 rosc/^/SZO. 



"Cross Secf ton macadam road, /8f6, 



'Cross-Secf/ori of modern macadam (Massachusetts) road: 

 j*//y* 1/sAapeof tit/ndat/an: 



Cross Section of modern meca&am- roaof. 



Figure 218. Several forms of stone roads, showing historical types. Pre- 

 pared by Maurice O. Eldridge. 



