113 
cient amount of ground to give certainty to the result. I 
have however so much confidence in those now detailed, 
that I have no hesitation in giving it as an ascertained 
law, that a specimen of cast iron having at 70° Fah. a given 
power of resistance to transverse strain, will on its tempera- 
ture being reduced to zero have that power increased by 
3 per cent. 
Breaking weight of Jin. square, 
iron bars, 9in. between points of 
pension at 70 deg. Fakr, 
cast 
sus- 
Breaking weight of .Jin. square cast 
iron bars, 9in. between points of sus- 
pension at Zero. 
Cwt. Qrs. Lbs. 
Cwt. Qrs. Lbs. 
Btfd.129 2 21 
Cwt. Qrs. 
Lbs. 
Cwt. Qrs. Lbs. 
Bt.fd. 139 1 22 
JNo. 1 
4 
0 
14 
No. 36 
3 
3 
14 
No. 1 
4 
1 
15 
No. 36 
3 
2 
25 
2 
4 
3 
26 
37 
4 
2 
24 
2 
4 
0 
14 
37 
5 
0 
14 
3 
3 
2 
2 
38 
4 
1 
1 
2 
3 
0 
10 
38 
4 
0 
4 
4 
3 
0 
14 
39 
4 
1 
14 
4 
3 
0 
6 
39 
3 
3 
4 
5 
3 
3 
16 
40 
3 
3 
12 1 
5 
2 
3 
20 
40 
4 
1 
15 
6 
3 
2 
14 
41 
4 
0 
14 
6 
3 
3 
18 
41 
3 
0 
12 
7 
3 
2 
10 
42 
3 
0 
14 
7 
3 
1 
12 
42 
3 
1 
0 
8 
3 
0 
0 
43 
4 
0 
6 i 
8 
4 
2 
14 
43 
4 
2 
8 
9 
3 
3 
0 
44 
3 
2 
1 
9 
4 
0 
22 
44 
3 
3 
22 
10 
3 
1 
1 
45 
4 
0 
0 
10 
4 
1 
15 
45 
3 
2 
0 
11 
3 
1 
14 
46 
4 
0 
27 
11 
4 
0 
14 
46 
4 
2 
1 
12 
3 
1 
14 
47 
4 
0 
22 
12 
4 
2 
1 
47 
4 
1 
1 
13 
3 
1 
24 
48 
3 
0 
2 
13 
3 
1 
26 
48 
4 
0 
4 
14 
3 
0 
14 
49 
3 
3 
14 
14 
4 
0 
4 
49 
4 
0 
3 
15 
3 
3 
0 
50 
4 
1 
8 
15 
3 
2 
8 
50 
4 
2 
14 
16 
2 
3 
14 
51 
4 
1 
15 
16 
4 
3 
0 
51 
4 
0 
12 
17 
4 
2 
8 
52 
4 
0 
24 
17 
4 
1 
15 
52 
3 
0 
18 
18 
4 
1 
1 
53 
3 
0 
5 
18 
3 
2 
i 
53 
3 
2 
8 
19 
3 
1 
0 
54 
3 
2 
27 
19 
4 
1 
15 
54 
4 
0 
15 
20 
3 
3 
20 
65 
4 
3 
0 
20 
4 
2 
1 
55 
4 
1 
12 
21 
4 
1 
0 
56 
3 
2 
4 
21 
4 
2 
24 
56 
3 
1 
13 
22 
3 
0 
12 
57 
4 
0 
12 
22 
3 
2 
26 
57 
4 
1 
26 
23 
4 
1 
0 
58 
4 
0 
14 
23 
4 
1 
1 
58 
2 
3 
10 ■ 
24 
3 
3 
14 
59 
4 
0 
0 
24 
4 
1 
26 
59 
4 
1 
26 
25 
4 
0 
0 
60 
4 
1 
1 
25 
3 
3 
12 
60 
3 
2 
20 
26 
3 
2 
14 
61 
4 
0 
18 1 
23 
3 
0 
14 
61 
4 
0 
0 
27 
3 
1 
18 
62 
4 
0 
12 1 
27 
4 
1 
15 
62 
3 
2 
24 
28 
3 
2 
22 
63 
4 
0 
11 
28 
3 
0 
12 
63 
3 
O 
o 
15 
29 
4 
0 
14 
64 
4 
0 
4 
29 
4 
2 
14 
61 
3 
0 
20 
30 
3 
3 
1 
65 
3 
3 
10 
30 
3 
2 
15 
65 
4 
0 
14 
31 
4 
0 
26 
66 
3 
1 
18 
31 
3 
0 
22 
66 
4 
0 
4 
32 
3 
3 
8 
67 
3 
1 
7 
32 
4 
3 
13 
67 
3 
0 
20 ; 
33 
4 
2 
7 
68 
3 
2 
6 
33 
4 
1 
14 
68 
3 
2 
12 
34 
2 
2 
14 
69 
4 
3 
0 
34 
4 
0 
13 
69 
4 
2 
1 
35 
3 
2 
1 
70 
4 
1 
0 
35 
3 
2 
18 
70 
4 
0 
1 
Ford. 129 
2 
21 
268 
3 
is ! 
Ford. 139 
1 
22 
276 
3 
0 
Fahr. Cwt. 
At 70 deg. 268 
At Zero 276 
Qrs. Lbs. 
3 18 
3 0 
Mr. Thomas Carrick called attention to the fact that the 
