142 



Dr. S. W. Richardson on the Magnetic 



meability between 20° and 380° is greatest for fields of about 

 2'2 C.G.S. units. The curves are more rounded in general 

 outline both for high and low fields than for fields of medium 

 strength. 



Fig. 14. 



400 



1-0 2-0 3-0 4-0 5-0 6-0 70 80 90 10-0 110 12-0 



The values from which these curves were obtained are 

 given below (Table opposite page). 



Alloy JYo. II. 



This alloy contained about 10 per cent, of aluminium. It 

 was too hard to be cut by ordinary tools. The molten metal 

 was cast into a ring of 6*57 cms. external diameter, and 2*92 

 cms. thick. The ring was subsequently cut into two by 

 means of a diamond wheel, and an analysis was made of the 

 upper half. 



