ON STRENGTH AND PROPERTIES OF CAST IRON. 407 
they contain, which seldom exceeds 212°. The same causes are, 
nevertheless, in operation, and must continue to be so under the 
varied influences of caloric action. 
Had time permitted, it was my intention to have pursued the 
experiments on temperature under a much greater degree of 
form and change than is here exhibited. For example, it might 
have been desirable not only to load the bars until they were 
broken, but also to charge them with different weights, and, by 
alternate heating and cooling, to have ascertained how far the 
bars so charged were affected by the change. Such an extension 
of the experiments might have led to the development of some 
new feature in the actions thus produced, and that more parti- 
cularly by the introduction, abstraction, re-introduction, &c. of 
the different increments of heat. As it is, the bars were all 
broken at the temperatures indicated in the tables. 
TaBLE XV. 
Coed-Talon, Cold Blast. 
To determine the relative strengths of Coed-Talon Hot and Cold Blast Iron, 
to resist a transverse strain under different degrees of temperature. 
No. 2 Iron. No. 2 Iron. No. 2 Iron. No. 2 Iron. No. 2 Iron, 
Experiment 1. Experiment 2. Experiment 3. Experiment 4. Experiment 5. 
Depth of bar, 1:068|Depth of bar, 1:020) Depth of bar, 1:008||Depth ofbar, 1°006)|Depth of bar, 1:038 
Breadth of do. 1°024||Breadih of do. 1:005|| Breadth of do. +996 ||Breadth of do. 1°021|/Breadth of do. 1°023 
{Distance between ||Distance between || Distance between ||Disiance between ||Distance between 
supports 2 ft. 3 in. || supports 2 ft. Sin. || supports 2ft. Sin. |) supports 2 ft. Sin. supports 2ft. Sin. 
Pee se Sea a) sere ey el a) eS sl eae dis 
V2/83| 8 lal S/8e] 2] a) 2) 8s] 2) alleles! slaleles)] 2] ¢ 
Vees a |e) Slee] & | el See] | ee se] & | el e|es| & | & 
NEI AIRE PA REA FRR TEA Pe eA Pam 
112) 034) ... 126°) 112) -041 28°!/112)-040 | + |32°)|112) -035 32°}}112) 034 114° 
_ |224) -071)-007 | ... || 224] -090|-009 | ... || 224] 076 |-007 |... ||224) 074 we. [224] 072 a 
_ {336} -101)-010) ... || 336) -1382)-011 | ... ||336)-117 |-010].., 1336) "114 | 4 |... 1836] "104 |-005] ... 
{448} +149) ... |... || 448]-187) ... |... 448] -156 +013]... |l448! -151 |-007 |... |/448]-144 |-008 |113° 
{560} 189-017 | ... || 560) -242|-027 | ... || 560} -197 |-018] ... 1560) -204 |-012 | ... 560) -182 |-013] ... 
672) -224)-031 | ... || 672) 310) ... |... ||672|-244 |-024 | ... |]672) -252 |-021]... 672/224 |-019) ... 
784) 271/030 784} -382|-053 | ... ||784| -296 |-035 | ... ||784) 311 |-033 | ... [1784] -274 |-028 |112° 
896) 341 896| -461)-082 | ... || 896] 352 |-049 | ... 1896) *374 |-051 |... ||896|(824) broke 
9Ajbroke| .., 938)broke! ,,, 
.*. Ultimate deflec- 
tion = °385.—This 
bar was broken in 
.. Ultimate deflec- 
tion = ‘487. — This 
bar 
the 
« 1952|(-380)|broke] ... 
This bar was broken 
when buried in 
snow. 
was broken in 
4 r 
open air. Di ac 
980|(-420)}broke| ... 
This bar was broken 
when buried 
in 
Broken in water. 
The microscopic appearance of this iron will be found at No, I. Table, on the 
transverse strain, 
