36 
MR. S. W. J. SMITH ON THE THERMOMAGNETIC ANALYSIS OF 
required to produce it is interesting. It is shown for each of four series of 
experiments in fig. 7. 
Fig. 7. Curves showing relation between heating current and temperature for each ring. 
The conditions under which the heating took place differed appreciably in the 
different series. For example, in the experiments with meteoric iron (first winding) 
