;06 



YOSHIJIItO KATO ; 



rigorously there can be no such thing- as absolutely immediate effect, 

 and Ewing surely means by the immediate effect an effect which is pro- 

 duced immeasurably fast. But one will easily see that there can be no 

 sharp demarcation separating the immeasurably rapid immediate effect 

 from the extremely slow creeping, but that the change from one to the 

 other will occur gradually and continuously. 



Such being the case, in order to compare the rate of growth under 

 various circumstances, we must have recourse to some other means 

 than that of merely subtracting the immediate effect, as determined by 

 compensation, from the subsequent readings. 



I therefore endeavoured to find the curves giving the relation 

 between the intensity of magnetisation at the several instants and the 

 corresponding times, by means of an equation, and to compare the 

 constants thereby obtained. For that purpose the series of more 

 careful experiments which follow were made. 



Experiment 5 gives the ordinary curve of magnetisation, the 

 readings being reduced to those at 15 seconds after " make." 



The other experiments give the time curve. The first column gives 

 the time in seconds after "make." The second column gives the read- 

 ings in mm. corresponding to the several instants in the first column. 

 The third column gives similar readings taken once more immediately 

 after subjecting the wire to the process of demagnetisation by reversals. 



All the readings are properly corrected, and reduced to those at 15 seconds after " make.' 



