76 Messrs. K. Honda and T. Terada on the Change of 



deflexion due to the weight. Next, a field was applied and 

 the procedure repeated ; in this way, we obtained the values 

 o£ deflexions corresponding to the different fields, the 

 demagnetization being, of course, carefully made before each 

 experiment. The difference of the deflexions in a certain 

 field and in no field gives the change of rigidity. 



The sensitiveness of the present arrangement was such 

 that a deflexion of 1 mm. of the scale reading corresponded 

 to a twist of 7 f/, 64xl0~ 3 per cm. of the specimen. The 

 specimens tested in the present experiments were those used 

 in the previous experiments above quoted, and had the 

 following dimensions : — 



Metals. Diameter. Length. Bigidity. 



Soft iron . . . 0-986 cm. 20-43 cm. 7'92 x 10 11 



Nickel 1-115 cm. 21'12 cm. 7'llxlO 11 



On the other hand, the determination of the change of 

 rigidity by the ordinary method of first applying the couple 

 and then the magnetizing field was always made, and the 

 results obtained by the two different methods were compared. 

 The magnetizing coil was the same as that used in the 

 last experiment, so that the heating effect due to the magne- 

 tizing current was negligibly small. 



In using the present arrangement, all necessary precautions 

 were taken, which were referred to in the paper above quoted. 

 The results are given in the following : — 



Nickel. PI. IV. figs. 11 & 42. 

 Table XXXIII. u 



14°- 7 C. 



N=7-00xl0 r '. 



N = 14-09 xl0«. 



N=21-27xl0. 



0=1 



2"83. 



0=25 "-83. 



0=38"-98. 





^K r ™ 





SK' 





#K' 



H. 



r xlO 2 . 



H. 





II. 



K" Xl °- 



6-3 



+ 0-05 



63 



+0-07 



5-6 



4-0-05 



145 



+0-12 



13-5 



4-0-12 



134 



+011 



20-5 



-0 02 



20-5 



-001 



22-0 



-007 



284 



-0-34 



26-7 



-0-31 



26-1 



-024 



34-9 



-0-65 



350 



-0-68 



33-8 



-0-60 



56-0 



-1-37 



55-7 



-1-37 



55-7 



-1-24 



82-8 



-1-35 



83-5 



-1-33 



81-0 



-1-20 



114-0 



-0-60 



115-8 



-0-59 



114-0 



-0-50 



164-8 



+ 1-15 



167-0 



-f 1-16 



164-8 



4144 



23G 



+ 340 



238 



4-3-39 



236 



4-3-22 



288 



+4-59 



292 



+ 4-61 



289 



+ 4-34 



359 



+ 5-81 



365 



4-5-87 



362 



45-57 



407 



+ 6-38 



412 



+648 



410 



4-6-17 



519 

 i 



+ 7-39 



523 



4-7-53 



51S 



1 



4-7-21 



