106 
Table B. 
Effect of Hydrochloric Acid on Unannealed Iron Wire. 
Description. 
Diam- 
eter, 
inches. 
Ulti- 
mate 
Elonga- 
tion. 
Increase 
in 
ditto. 
Breaking 
strain. 
Breaking 
strain per 
sq. inch of 
section. 
Increase 
in 
ditto. 
No. of te.sts 
of wh. the 
mean is given 
Unanneal’diron ' 
wire immersed 
in acid 1 hour.. ^ 
Same piece as" 
above after be- 
• 
•136" 
i2-0°/o 
lbs. 
1193 
lbs. 
82.150 
3 ; 
i 
ing 12 hours in 
hot chamber of 
tern. 40°-200°C^ 
> 
■136" 
2'83°/„ 
0-83°/o 
1226-6 
84,539 
2,389 
3 
’ Dec. in B. strain after immersion in acid=:2,3891b8. iier sq. in. or abt. 3°/^, 
„ elongation „ „ =0-83 °/q 
Table C. 
Effect of Hydrochloric Acid on Annealed Mild Steel 
(about '22°/o Carbon), 
Number 
of 
1 piece. 
Diameter, 
inches. 
Elongation 
after immer- 
sion in Hydcl. 
for 6 hours. 
Elongation 
after being 
heated 12 hrs. 
to a tern, of 
100 C. 
B. strain after 
immersion in 
Hycl. for 6 hrs. 
B. strain after 
being heated 
12 hom’s to a 
tern, of 100 C. 
1 
1 ' 
( 
•135" 
197o 
167o 
828 lbs. 
840 'lbs. , 
•135" 
19 „ 
17 „ 
824 „ 
836 „ 
•135" 
20 „ 
16 „ 
836 „ 
860 „ 
r 
•135" 
20 „ 
14 „ 
730 „ 
780 „ 
2 ] 
•135" 
20 „ 
13 „ 
730 „ 
754 „ 
( 
•135" 
20 „ 
16 „ 
770 „ 
820 „ 
c 
•135" 
21 „ 
16 „ 
728 „ 
770 „ 
3 ] 
•135" 
20 „ 
17 „ 
742 „ 
800 „ 
1 
•135" 
22 „ 
14 „ 
736 „ 
794 „ 
Average. 
•135" 
20-1 
15-4 «/o 
769-3 lbs. 
538001bs.pr.sq.in. 
806 lbs. 
563631bs.pr.sq.in. 
Decrease in B. strain after immersion =: 2,563 lbs. or 4‘56°/o 
Increase in elongation „ = 4'7°/o 
