144 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



Figure 12 represents observations made in the Jefferson Laboratory upon 

 second specimen of Norway Iron. 



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Figure 13. This Figure shows results obtained from tests made upon a 

 specimen of Bessemer steel, 8.0 cms. long and 1.26 cms. in diameter. For 

 low excitations the tests were made in a long slender solenoid. For higher 

 fields a modification of the Isthmus Method was used. 



