562 Messrs. K. Honda and S. Shimizu on 



If the alloys be cooled in liquid air, the hysteresis-loss 

 increases. With irreversible alloys, the increase is enormous. 

 The applicable limit of Steinmetz's formula becomes greatly 

 extended. Thus we may say, as in the case of the pure 

 metals, that the cooling in liquid air hardens the specimens 

 magnetically. 



As regards the residual magnetism, the cooling con- 

 siderably increases it. 



(e) Length Change of Ferromagnetic Metals. 



Table V. and figs. 3 a, b (PL X.) give the observed changes 



of length at the temperatures of room and of liquid air. 



hi 

 Here -j denotes the elongation per unit of length. 



Table Y. 

 Swedish Iron. 



^ 



°-5C. 



*=-] 



L86° C. 



t=22 



°0O. 





SI 





si 





si 



H. 



T xW. 



H. 



T xl ° 6 ' 



H. 



I x 106 - 



40 



0-21 



3-0 



09 



4-0 



07 



8-5 



2-7 



5-3 



1-5 



5 1 



16 



21-7 



3-5 



200 



3-2 



117 



34 



724 



3-3 



665 



3-2 



37 



4-2 



1 235 



2-4 



165 



0-9 



1040 



33 



2175 



013 



274 



-20 



214 



11 



326 



-2-3 



396 



-4-5 



313 



-0-8 



483 



-4-8 



565 



-7-6 



478 



-33 



640 



-6-2 







642 



-45 



7i'2 



-7-0 



814 



-10-2 



839 



-51 



Tungsten- St eel. 



t=23 



°-2 0. 



^=-186° O. 



*=30°-7 C. 



H. 



fx!0, 



H. 



r x 10 ° 



H. 



7 x 10 ° 



100 



02 



176 



0-9 



137 



10 



139 



1-5 



30-0 



31 



20-7 



31 



31-0 



35 



91-0 



4-3 



45-7 



4 3 



81-0 



4-6 



174 



4-3 



1123 



4-8 



209 



4-4 



287 



3-4 



174-2 



4-5 



393 



3-4 



366 



31 



363 



34 



507 



2-6 



525 



23 



527 



2-6 



671 



24 



5S7 



21 



640 



23 



818 



2-1 



827 



1*5 



848 



1-9 



