Stdlloi/. 341 



(3) The results slightly differ from those of other ex- 



perimienters, the permeability being generally a 

 little lower in our results than in theirs. 



(4) " Stalloy " behaves very much like ordinary iron 



under varying frequencies. 



(5) The constancy of the value of the hysteresis loss for 



different frequencies is remarkable. 



In conclusion, we desire to express our thanks to Professor 

 Lyle both for his valuable advice and kindly interest and also 

 for placing the necessary apparatus at our disposal. Our 

 thanks are also due to Messrs. Weymouth and Co., Melbourne, 

 for supplying the samples used in the experiments and for 

 stamping out and annealing the same. 



EXPLANATION OF PLATES LXIL-LXV. 



Plate LXIL 

 Graph showing permeability, retardation, total loss and eddy 

 current loss for both annealed and unannealed "Stalloy." 



Plate LXIII. 



Fig. 2a. — Variation of 3rd and 5lh harmonic phase-angles with 



the induction, for "Stalloy." 

 Fig. 2b. — Variation of 3rd and 5th harmonics for "Stalloy." 



Plate LXIV. 

 Variation of the iron losses with induction for different frequen- 

 cies for " Stalloy." 



Plate LXV. 

 Variation of permeability and retardation with the induction for 

 difierent frequencies. 



