40 



K. TSURUTA. 



§ 14. "An instructive method of studying the influence of 

 vibration in destroying or rather in greatly reducing hysteresis, is to 



partially load or unload in the ordinary way, and then pausing at any 

 stage in the process, to tap the \vire." (I) The following is one of my 

 experiments carried on according to this method, the diameter of the 

 wire tested being- 0*77 m.m. It is set forth in Fis - . 14, Fl. IL 



This experiment exactly verifies the results given by Prof. 

 Ewing. (2) As he remarks, the maximum points on the portions cor- 

 responding to partial loadings in the "on " branch are quite charac- 

 teristic. So also are the minimum points on the portions corres- 

 ponding to partial unloadings, in the "off" branch. Beyond the 

 minimum points of the main cyclic curve, owing perhaps to the stable 

 conditions in which the iron now exists, these features become some- 

 what altered in a way apparent from the figure. 



Again, it will be seen that at points lying in the region between 



(1) Prof. Ewing, Exp. Reseaches in Magnetism, § 74. 



(2) 1. c, § 38-39. 



