MAPS AND RECORDS. 



99 



finished map, it is better to indicate the drains by 

 broken black lines. 



Scale 800 ft =»1 iiwli 



Fig. 22. — ^Drainage Plan for a Farm of i6o Acres of Level Land. 



Conventional Topographical Signs. — These are rep- 

 resentations of some of the leading features of the land 

 by arbitrary signs which resemble the objects as we 

 look down upon them. A sufficient number of these 

 should be used to indicate to the eye at a glance what 

 the character of the surface is. This representation 

 should be aided by words of description where full de- 



