85 
The following experiments with rails were made at the 
works of the Darlington Iron Company, November 30th, 
1869. 
The rails were taken promiscuously from a lot of 1,000, 
all supposed to be of the same quality, weight, and exact 
section. It had been found that the rails which were then 
in course of manufacture for the East Indian Railways at 
these works, and which were of a very high quality, failed 
to pass the required test in frosty weather, whereas in 
ordinary temperatures a failure was a very rare occurrence. 
The ten rails were accordingly selected to settle the question 
whether higher and lower temperature affected the strength 
of the rails. Four rails were heated up to 120° Farenheit ; 
the other six were tested cold, the temperature of the 
atmosphere being about 26°. 
Test of East Indian Railway Rails, 82lbs. per Yard, Not. 29th, 1869, 
TESTED BY A FALLING WEIGHT OF 2,000LBS. ; CENTRES OF SUPPORT, 
3 FEET 6 INCHES APART. 
No. 
No. of Blows. 
Height of 
Fall. 
Permanent 
Set. 
Temperature 
Bemarks. 
1 
fist blow 
-l 2nd „ 
V3rd „ 
5ft. Oin. 
5 0 
7 0 
7-16tbs 
3-4ths 
> 
>■ 120 deg. 
Not broken. 
2 
fist „ 
i 2nd .. 
V3rd „ 
5 0 
5 0 
7 0 
3-8ths 
13-16tlis 
{ Do. 
Ditto. 
3 
fist „ 
{S 
5 0 
5 0 
7 0 
3-8ths 
13-l6tha 
^ Do. 
Ditto. 
i 
{ 2 nd ;; 
\3rd „ 
5 0 
5 0 
7 0 
3-Sths 
7-8ths 
{ Do. 
Ditto. 
5 
( 1st blow 
1 2nd „ 
5ft. Oin. 
5 0 
3-Sths 
broke 
j- 26 deg. 
Broke with 2nd blow. 
6 
( 1st „ 
(2nd „ 
5 0 
5 0 
3-8ths 
6-8tlis 
| Do. 
Passed test. 
7 
(1st „ 
1 2nd „ 
5 0 
6 0 
3-8tlis 
broke 
j- Do. 
Broke with' 2nd blow. 
8 
fist „ 
( 2nd „ 
6 0 
5 0 
3-8ths 
broke 
j- Do. 
Ditto ditto. 
9 
1st „ 
5 0 
broke 
Do. 
Ditto with 1st' blow. 
10 
1st „ 
l 2nd „ 
5 0 
6 0 
3-Sths 
broke 
j- Do. 
Ditto -with 2nd blow. 
