89 
across the fibre in oil and water baths, and those under the 
freezing point were made in a snow bath reduced to zero. 
The summary of results is as follows : — 
SUMMARY OP RESULTS. 
No. of 
the Expe- 
riments. 
Temperature 
Fahr. 
Breakage weight 
per square inch 
in lbs. 
Breakage weight 
per square inch 
in tons. 
REMARKS. 
Duration of 
strain in regard 
to fibre. 
1 
0° 
49009 
21-879 
With. 
2 
60° 
40-357 
18-001 
Across. 
3 
60 
43-405 
19-377 
Across. 
4 
60 
50-219 
22-414 
With. 
5 
110 
44-160 
19-714 
Across. 
6 
112 
42-088 
18-7S9 
With. 
7 
120 
40-625 
18136 
With. 
S 
212 
39-935 
17-828 
With. 
9 
212 
45-689 
20392 
Across. 
10 
212 
49-500 
22098 
With. 
11 
270 
44-020 
19651 
With. 
12 
340 
49-968 
22-307 
With. 
13 
340 
42-088 
18-789 
Across. 
14 
395 
46086 
20-574 
With. 
15 
Scarcely 
Red 
38032 
16*978 
1 
Across. 
16 
Dull Red 
30-513 
13-621 
Across. 
From the above it will be seen that the plates from which 
these results are obtained are much stronger in the direc- 
tion of the fibre than across it. 
The above experiments are quite conclusive as regards 
the strength of wrought iron plates, till they approach red 
heat. At that temperature nearly one half the strength 
is lost ; it becomes exceedingly ductile, and may be drawn 
to a considerable extent in the direction of the fibres before 
it breaks. 
Another sei’ies of experiments were made on wrought 
iron bars, which indicated somewhat different results. In 
these experiments, the specimens from the same works 
attained the maximum of strength, and gave at the tem- 
perature of 415°, a resistance of 3 9 '072 tons per square inch, 
and at zero, and 00° there were little or no differences, ex- 
cepting in the case of temperature when the resistance was 
increased from 28 , 419 at zero and 60°, to 39 tons per square 
