106 
Table B. 
Effect of Hydeochloeic Acid on Unannealed Ieon Wiee. 
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 tests 
of wh. tlie 
mean is given 
Unanneal’diron ' 
lbs. 
lbs. 
wire immersed ! 
in acid 1 hour.. ^ 
•136" 
S2-0°/o 
1193 
82.150 
3 
Same piece as"] 
above after be- 
ing 12 hours in 
1 
•136" 
2-83»/„ 
0-83°/„ 
1226-6 
84,539 
2,389 
3 
hot chamber of 
i 
tern. 40°-200°C^ 
1 
! 
Dec. in B. strain after immersion in acid=2,3891bs. per sq. in. or abt. 3°/^, 
„ elongation „ „ =:0-83°/o 
Table 0 . 
Effect of Hydeochloeic Acid on Annealed Mild Steel 
(about *22°/o Caebon), 
Number 
.0^ 
I piece. 
Diameter, 
inches. 
Elongation 
after immer- 
sion in Hydcl. 
for 6 hours. 
i 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 hours to a 
tern, of 100 C. 
_ 
c 
•135" 
197o 
167o 
828 lbs. 
840 lbs. 
1 
•135" 
19 „ 
17 „ 
824 „ 
836 „ 
( 
•135" 
20 „ 
16 „ 
836 „ 
860 „ 
c 
•135" 
20 „ 
14 „ 
730 „ 
780 „ 
2 ^ 
•135" 
20 „ 
13 „ 
730 „ 
754 „ 
( 
•135" 
20 „ 
16 „ 
770 „ 
820 „ 
•135" 
21 „ 
16 „ 
728 „ 
770 „ 
i 3 ] 
•135" 
20 „ 
17 „ 
742 „ 
800 „ 
! ( 
•135" 
22 „ 
14 „ 
736 „ 
794 „ 
Average. 
•135" 
20-1 »/„ 
15-4°/, 
769-3 lbs. 
.'j38001bs.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 
