ON STRENGTH AND PROPERTIES OF CAST IRON. 
409 
Results reduced to those of bars 1:00 inch square, and 2 fi. 6 in. 
between the supports. 
Experiment Ist, No. 
Experiment 2nd, No. 
Experiment 3rd, No. 
Experiment 4th, No. 
Experiment 5th, No. 
seeeee 
lot eeeee 
ences 
Temperature: 
eee] cee 
Specific 
gravity. 
Modulus | Breaking 
of weight in 
elasticity.| lbs. (6). 
14267500} 823-10 
13723500 
14283200 
14003350 
933-4 
906-0 
14500000 
15538300) 800-29 
14902900) 811-69 
919°7 
877°5 
; Product 
Ultimate | 6 x d, or 
deflection) power of 
(d). | resisting 
impact. 
3865 309°3 
“4140 340'8 
4002 325:°0 
436 4669 
423 383-2 
“429 395:0 
421 | 369-4 
The infusion of heat into a metallic substance may render 
it more ductile, and probably less rigid in its nature; and I ap- 
prehend it will be found weaker, and less secure under the 
This is observable to a considerable 
effects of heavy strain. 
extent in the experiments ranging from 26° up to 190° of tem- 
perature. 
The cold blast at 26° and 190°, is in strength as 874: 743, 
d 
an 
The hot blast at 21° and 190°, is in strength as 811: 731; 
being a diminution in strength as 100: 85 for the cold blast, 
and 100: 90 for the hot blast, or 15 per cent. loss of strength in 
the cold blast, and 10 per cent. in the hot blast. 
