Properties of the Alloys of Cast-iron and Aluminium. 621 



thermometer. As, however, the heating and cooling were 

 conducted very slowly, the authors believe it to be a true 

 temperature hysteresis effect. 



The balance method (described in Part I.) was used in these 

 experiments. This method, which is inapplicable when the 

 permeability is large (except in the case of laminated rings), 

 enables smalt permeabilities to be determined with ease and 

 accuracy. 



The curves obtained are shown on fig. 5 and were plotted 

 from the following readings. 



I 



First Series : with rising Temperatures. 



H= 



32. 



41=3-48. 



T. 



B. 



T. 



B. 



584 



496 



547 



360 



601 



294 



580 



197 



606 



• 262 



594 



152 



619 



227 



600 



136 



636 



227 



604 



122 



644 



258 



614 



112 



650 



319 



619 



108 



653 



324 



626 



112 



654 



303 



630 



115 



656 



275 



635 



116 



663 



222 



637 



120 



083 



97 



638 



123 



697 



48 



640 



130 







643 



134 







644 



136 







646 



147 







648 



165 







649 



174 







650 



179 







655 



172 







657 



162 







660 



148 







6613 



131 







683 



53 







700 



21-4 







703 



16-9 







708 



13-0 







722 



7-3 







735 



71 







741 



64 



