79 
Size of 
No. Bar. 
1 
2 
3 
4 3ft. by lin. 
5 I by lin. 
between the 
6 supports. 
8 
g 
Deflec- 
tion. 
Breaking 
Weight. 
Ave- 
rage. 
Temperature. 
Remarks. 
0 625 in. 
0'562 ,, 
0-687 „ 
790 lbs. 
840 „ ) 
>842-5 
845 „ j J 
825 lbs. 
About 26° Fah.^ 
a a T 
a a J 
Exposed to 
frost in 
the open 
yard. 
0-687 „ 
0-687 „ 
0-687 „ 
820 lbs. ' 
850 „ 
865 „ 
845 lbs. 
32° Fah. 
ti ti 
ii ii 
Left in 
the sand 
in the 
Foundry. 
0-812 „ 
0-812 „ 
0-812 „ 
950 lbs. > 
945 „ 
945 „ J 
950 lbs. 
45“ Fah. 
120“ to 130“ „ 
45“ „ 
( This bar 
■j was 
( warmed. 
The results show a gradual and considerable decrease of 
strength in the bars, with the increase of cold below the 
freezing point. They also lost their elasticity in a similar 
degree. 
A further trial was made at Messrs. Jacksons’ works with 
similar bars and the same admixture of metals, January 
10th, as detailed in the following table. One bar was cooled 
to a temperature of 15° by a mixture of snow and salt. 
Size of 
Deflec- 
Breaking 
No. 
Bar. 
tion. 
Weight. 
Average. 
Temperature. 
Remarks. 
1 
'\ 
0-6875 in. 
780 lbs. 
780 lbs. 
15“ Fah. 
2 
0-75 in. 
815 lbs. 
35° Fah. 
3 
0-76 „ 
840 „ 
844-3 lbs. 
35“ „ 
4 
3ft. long 
between 
- Bearings 
by lin. by 
0'8125 ,, 
878 „ J 
35“ „ 
5 
0 75 in. 
845 lbs. > 
62° Fah. 
6 
lin. 
0-6875 „ 
855 „ 
859-25 lbs. 
62“ „ 
7 
0-8125 „ 
867 „ 
52“ „ 
8 
0-8125 „ 
870 „ , 
52“ „ 
9 
/ 
0'S8 in. 
893 lbs. 
893 lbs. 
70“ Fah. 
These experiments are borne out by the general ex- 
perience of ironfounders, many instances having come to 
my knowledge during these investigations, a few examples 
of which may be cited. 
