362 



MAGNETIC METHOD 



[Chap. 8 



is in the measurement of the inclination. Standard earth inductors in this 

 country are those of the Coast and Geodetic Survey and the Carnegie 

 Institution of Washington. The instrument of the former is illustrated in 

 Hazard;^* that of the latter in Dorsey's article.*^ Two types are made in 



American Askania Corp. 



Fig. 8-38. Large earth inductor. 



Europe by the Askania Company — a large type for observatory use (see 

 Fig. 8-38) and a small type for field surveys (see Fig. 8-35). Details 



« Op. ciL, fig. 10, p. 77. 

 " Op. ciL, fig. 2. 



