466 Dr. E. Rhoads on the Change in 



will show to what extent this has been questioned. It is, 

 however, important to provide in experiments on this subject 

 not only that the magnetization of the part whose expansions 



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Upper curve for specimen 2 mm. wide. 

 Lower curve for specimen 1 mm. wide. 



and contractions are measured should be uniform, but also 

 that that of the metal adjacent on all sides should be so ; for if 

 not, its distortions will be communicated elastically to the part 

 under consideration. 



The next set of curves (fig. 4, p. 467) bears on the effect of 

 annealing. Those which are marked " hardened by shearing," 

 are for the specimens just as they were cut from the sheet of 

 soft iron by a die made for the purpose. Then they were 

 annealed in a stream of hydrogen at a full red-heat, though 

 this was not hot enough to anneal them completely, as is 

 shown by the greater increase of retentiveness obtained in 



