48 



FIELD GEOLOGY. 



The same method applies whether the line of true 

 dip has been found by Eule A or B, and the angle re- 



33 



\ 



4! 



N\!8?W. 



B 



Fig. 17.* 



quired can be found from either of the apparent dips, or 

 it can be worked out from both as a check upon the 

 result. 



* For the loan of this woodcut, and another (fig. 20), the author 

 is indebted to the Editors of the " Geological Magazine." 



