METHODS OF MAP MAKING 
119 
Alternative Methods. 1 . Compass and chain may be 
used to survey the roads and the plotting done off the field. 
This is most convenient in wet weather, but when a traverse 
board is at hand and can be used, it will be found the 
quickest method of survey and the least liable to error. 
2. Transit and stadia might be substituted for both 
evel and traverse board in the survey of the roads, and, 
.vhere the woods are open enough, in mapping the detail 
)f the topography. This method involves much comput- 
ng, is generally cumbersome, and except in the hands of a 
killed and practiced man is liable to give rise to error. 
