1910 - 11 .] On Magnetism of Copper-Manganese-Tin Alloys. 95 
similar to that found by the authors in the case of copper-manganese- 
aluminium alloys, namely, a steady diminution in susceptibility towards a 
limiting value for the temperature employed, and an increased coercive 
Table VII. — Tests at Various Temperatures. 
Alloy. 
Test. 
Temperature of Testing. 
-190°. 
15°. 
. 75°. 
125°. 
180°. 
230° C. 
/■ 
i 20 
21 
18 
15 
11 
8 
2 
I AO 
42 
36 
30 
26 
19 
3 
67 
55 
46 
37 
26 
4 
14 per cent, tin < 
1 200 
93 
72 
60 
46 
34 
5 
108 
80 
67 
50 
36 
5 
31 
21 
18 
13 
8 
1 
C.F. 
27 
22 
21 
20 
18 
9 
1 20 
30 
28 
24 
20 
11 
4 
l 
Uao 
62 
55 
46 
37 
19 
7 
T 
i 100 
96 
77 
63 
48 
27 
10 
16 per cent, tin - 
1 200 
127 
96 
76 
58 
31 
12 
1 300 
144 
105 
84 
61 
33 
13 
T 
x r 
26 
16 
14 
10 
5 
2 
\ 
C.F. 
12 
10 
9 
8 
7 
5 
1 20 
27 
24 
18 
12 
6 
2 
ho 
59 
52 
36 
23 
13 
4 
T 
-*-100 
102 
82 
59 
35 
19 
5 
18 per cent, tin •< 
f -200 
162 
117 
82 
49 
27 
9 
1,300 
195 
129 
89 
54 
29 
11 
I r 
23 
18 
13 
9 
5 
1 
C.F. 
16 
14 
13 
12 
10 
4 
r 
1 20 
22 
22 
22 
21 
21 
0 
T 
-1 50 
54 
54 
52 
50 
47 
0 
T 
-*-100 
96 
96 
92 
88 
83 
0 
38 per cent, tin -< 
f -200 
160 
160 
153 
142 
130 
0 
1 300 
209 
209 
201 
184 
160 
0 
I r 
11 
11 
11 
10 
8 
0 
C.F. 
10 
9 
9 
8 
7 
0 
force and hysteresis loss tending towards definite large values of these 
quantities.* The liquid air effect on the baked material was also con- 
siderably different from that on the normalised alloy. This will be seen 
from Table VI. 
Tests on Heating to various Temperatures . — Tests were also carried 
out on the alloys when the specimens were maintained at various tempera- 
* A. D. Ross and R. C. Gray, Proc. Roy. Soc. Edin ., xxix., 274 (1909). 
