100 



ENGINEERING FOR LAND DRAINAGE. 



tails are desired to be shown. Peculiarities of the soil 

 may be indicated in this way and thus useful facts be 

 recorded. A few of the more common conventional 

 topographical signs have already been shown in Fig. 2 3 . 





jm 



1&. 





.^i/^- 



^MA 



^'Jl. 



Swamp 



Plow Land 



Grass 



Pond 



*% 



% ^ 



^, ^. <S> 



4 



Orchard 



^. ^, 



Railroad 

 Bridge 



Ditch 





•^^ 



%?% 



^^(2^^ 





"Woods 



H' 5?r^ ^ '^■i' (^ \-\ 



^ 



Brush 



7^ 





Buildings 



Wagon Road 



Mud 



EiG. 23. — Conventional Signs used to Represent Topography. 



Lettering. — The style in which the lettering of the 

 map is done has a striking effect upon its general ap- 

 pearance. When a working map is made, the letter- 

 ing should be done in some free-hand letter which can 



