98 
Proceedings of the Royal Society of Edinburgh. [Sess. 
Annealing of the Quenched Material . — The reannealing of the material 
was tried. No procedure, however, would reverse completely the deteriorat- 
ing effect which had been produced in the magnetic quality by the quench- 
Table IX. — Tests on the Quenched Material. 
Alloy. 
Test. 
Normalised 
Material. 
Quenched 
350° C. 
Quenched 
/-W 580° C. 
15°. 
- 190°. 
15°. 
- 190°. 
15°. 
- 190°. 
r 
f 20 
18 
21 
17 
16 
0 
0 
ho 
36 
42 
35 
40 
0 
0 
1 100 
55 
67 
55 
69 
0 
0 
14 per cent, tin J 
1200 
72 
93 
72 
97 
0 
0 
I3OO 
80 
108 
81 
112 
0 
0 
I, 
21 
31 
21 
31 
0 
0 
< 
C.F. 
22 
27 
18 
24 
0 
0 
bo 
28 
30 
28 
30 
11 
12 
T 
x 50 
55 
62 
53 
63 
22 
27 
T 
x 100 
77 
96 
73 
97 
32 
41 
1 6 per cent, tin < 
T 
J -200 
96 
127 
91 
129 
42 
59 
I3OO 
105 
144 
100 
146 
47 
70 
I r 
16 
26 
15 
24 
4 
8 
C.F. 
10 
12 
10 
13 
8 
13 
, 
bo 
24 
27 
21 
23 
22 
12 
bo 
52 
59 
45 
53 
49 
28 
boo 
82 
102 
65 
88 
77 
57 
18 per cent, tin - 
T 
- L 200 
117 
162 
81 
129 
98 
107 
T 
-*-300 
129 
195 
89 
146 
111 
132 
b 
18 
23 
9 
17 
9 
18 
V 
C.F. 
14 
16 
6 
12 
6 
22 
r 
1 20 
22 
22 
6 
7 
13 
15 
bo 
54 
54 
12 
14 
30 
34 
boo 
96 
96 
21 
23 
51 
56 
38 per cent, tin < 
T 
a 200 
160 
160 
33 
36 
78 
85 
T 
-*-300 
209 
209 
42 
45 
97 
104 
T 
! r 
11 
11 
3 
4 
9 
10 
\ 
C.F. 
9 
10 
6 
7 
7 
7 
mg at 580°. Reannealing had little influence in restoring the coercive force 
to its initial value unless the duration of the annealing process was con- 
siderable, and then it is probable that the apparent restoration was really 
due to ageing of the material. Reannealing of material which had been 
quenched at 350° with a resultant increase in its susceptibility led to very 
complex effects. It may be stated, however, that when ageing or baking 
