1908-9.] Magnetic Properties of certain Copper Alloys. 
279 
a magnetic cycle. Prolonged heating at the same temperature slightly 
reduces the susceptibility, and greatly augments the coercive force and“the 
hysteresis loss. 
I 
20 
10 
% 
. 
V 
N 
\ 
\ 
V" 
V 
H=125 
S. 
' * — 
— 

H=30 
V 
_J 
O 
10 20 
30 hrs. 
I 
9 
6 
3 
O 
10 20 
3( 
3 hrs. 
Fig. 3. 
Fig. 4 shows the results of exposing the alloy B to steadily increasing 
temperatures. In each case the alloy was placed in a furnace at the 
required temperature, kept there for 3 hours, and then the furnace was 
shut off* and the alloy allowed to cool in position and tested cold. The 
tests were made for a series of temperatures from 50° to 480° C., each 
