20 ART. 7. — Iv. HOXDA AXD T. TERADA. 



From the results thus far described, it may be concluded 

 tliat in Swedish iron and tungsten steel, the final magnetization is 

 aöected in no inconsiderable degree by the order of magnetizing 

 and straining. This fact &tands parallel to the result of our pre- 

 vious experiment that in these metals, the change of elastic con- 

 stants by magnetization is considerably affected by the order of 

 applying the stress and the magnetizing field. 



II. NICKEL. 



The eiïëct of stress on the magnetization of nickel has been 

 thoroughly studied by several physicists, so that there remains 

 little to be studied about the eftect. Our present experiment has, 

 however, this characteristic that several effects of stress on magne- 

 tization were studied with the same specimen over a wide range 

 of the magnetizing field and with special attention to the hyste- 

 resis effect. 



{a) Change of magnetization by tension under constant 



field: {df, T)u. 



The initial effect of loading on magnetization in very weak 

 fields is an increase of magnetization by low tension, and a 

 decrease by high tension ; but the cyclic effect is always a 

 decrease, unlike the Villari reversal in iron. Above '1 C.G.>S. 

 units, however, the initial and the cyclic effects are always a 

 decrease of magnetization. 



In low tension, o^i or ''/^ decreases almost proportionally 

 with T; as T is increased, the rate of decrease becomes great, 

 and after passing through an infiexion point, it begins to 

 decrease, as shown in Fig. 1(). As the field is increased, 

 the decrease of magnetization passes through its maximum. 



