Chap. 7] 



GRAVITATIONAL METHODS 



273 



geologic structure were realized at an early date by Hugo von Boeckh 

 who gave an interpretation of some of Eotvos' earlier surveys and sug- 

 gested to him and his assistants the study of oil structures. Fig. 7-104 

 illustrates relative gravity values calculated from torsion balance measure- 

 ments for a profile in the Maros Valley in Hungary. It is seen that the 



100 E 

 Fig. 7-103c. Curvatures on Lake Shuvalovo. 



gravity minima correspond closely to the uplifted positions of the salt 

 beds and to the salt anticlines. 



Following Boeckh's publication, attempts were made in other European 

 countries to utilize the torsion balance for the mapping of salt domes 

 and salt anticlines. In 1917 W. Schweydar"* observed the gravity gradi- 



"0 H. V. Boeckh, Petroleum, 12(16), 817-823 (1917). 



1" W. Schweydar, Zeit. Prakt. Geol., 26, 157-162 (Nov., 1918). 



