88 Profs. J. A. Fleming and J. Dewar. On the 



2000 



4,000 6,000 6,000 



Induction in C.G.S. units. 



t 0,000 12,000 



Table III. Hysteresis Loss in Soft, Annealed Swedish Iron in Watts 

 per pound per 100 cycles per second for various maximum Induc- 

 tions. 



I. At +15C. 



II. At -185 C. (in liquid air). 



Maximum 



induction. 



B. 



688 ' 



3603 



6185 



9461 



11916 



Hysteresis 

 loss. 

 W. 



0-02519 

 0-4246 

 0-949 

 1-907 

 2-658 



were taken at ordinary temperatures are denoted by the small circles. 

 The observations for hysteresis loss which were taken at the tempera- 

 ture of liquid air are denoted by the crosses. It will be seen that 

 substantially the circles and the crosses lie on the same curve. The 

 results of these observations, therefore, show that there is practically 

 no change in the hysteresis loss in soft iron by cooling it to the tern- 



