146 



ENGINEERING ON THE FARM 



solidity to stand vertical. The earth side of the form 

 should have such stability that particles of earth will not 



..<-*. 



* 



Drr/m. or 



Fig. 142. Construction of wall forms 



fall as the concrete is poured, and it is customary to 

 provide for irregular trimming of the earth by making 



£-CO</&3£ tYrtl-tC 





Fig. 143. Method of construction of one- and two-course sidewalks 



the wall slightly thicker than when lumber is used on 

 both sides. 



