80 



Messrs. K. Honda and T. Terada on the 



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

 a decrease of magnetization. 



In low tension, SIi or &I C decreases almost proportionally 

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

 and after passing through an inflexion -point it begins to 

 decrease, as shown in fig. 16. As the field is increased, the 

 decrease of magnetization passes through its maximum. 

 Except in weak fields, the cyclic effect (SI C , T) H (fig. 16, 

 dotted lines) fairly coincides with the initial effect. Carves 

 (BUy H) T deduced from (8I», T) H are given in fig. 17, in full 

 lines. In weak fields, they fall steeply and then gradually 

 rise ; as the field is further increased, they slowly tend to 

 approach the axis of the field. 



Nickel. 

 Initial T = 167 gr./mm. 2 ; t = X4P'S G. 



] 



H'. 



T=855 



;r./mui. 2 



T=17 



11 gr. 



T = 3421 gr. 



T = 5089 gr. 



T = 8513 gr. 



Cli. 



dl c . 



SI V 



dl, 



oh 



dl c . 



dii 



- 41 



dl c . 



SI* 



ol c . 

 -108-6 



114 



4- 6-6 



-13-5 



+ 9-7 



-32-2 



4- 3-5 



- 81-0 



- 99-4 



- 9-2 



2-35 



- 5-8 



-18-4 



-18-4 



-42-8 



- 62-7 



-102-6 



- 85-5 



-128-1 



- 97-8 



-137-9 



3-89 



-10-9 



-20-2 



-29-2 



-47-7 



- 83-0 



-109-4 



-113-8 



-1434 



-132-1 



-163-6 



10-77 



-234 



-28-0 



-52-5 



-58-7 



-119-2 



-129-3 



-170-2 



-181-8 



-221-3 



-223-2 



31-06 



-23-3 



-24-5 



-54-0 



-55-1 



-122-8 



-121-2 



-189-2 



-185-5 



-267-5 



-261-1 



62-54 



-12-4 



-12-7 



-29-5 



-29-5 



- 76-0 



- 76-2 



-129-6 



-129-9 



-235-5 



-234-6 



135-2 



- 4-8 



- 46 



-10-6 



-107 



- 25-8 



- 261 



- 464 



- 47-5 



-113-2 



-114-4 



205-5 



- 20 



- 20 



- 4-6 



- 4-9 



- 11-3 



- 12-1 



- 20-5 



- 21-3 



- 49-3 



- 49-9 



364-7 



- 03 





- 0-6 





- 2-1 





- 4-1 





- 11-3 





The effect o£ applying the maximum tension at once is nearly 

 the same as that of the graduated applications of tension. 



The change of magnetization by tension under different 

 initial loadings, where the demagnetization was always 

 effected with the initial load, was also tested. For the same 

 increment ST of T, SI is in a marked degree less than that 

 in the last experiment. 



(b) Magnetization under Constant Tensions : (I, H) T . 



The magnetization increases steeply in low fields, and after 

 passing through an inflexion -point gradually approaches 

 saturation. The effect of tension is considerably large and 

 always to diminish magnetization ; curves (I, H) T become 

 less steep in weak fields with the increasing tension, and 

 tend to approach each other in strong fields. If we compare 



