THE ROYAL ARTILLERY INSTITUTION. 
313 
Tabulated Statement oe the Results of the Experiments. 
Number of 
experiment. 
Kind 
of 
metal. 
! Number of 
| coolings. 
1 Amount of 
j immersion. 
Form of article, &c. 
Dimensions, in inches. 
Before 
experiment. 
After 
experiment. 
Difference. 
l a 
Wrought- 
5 
* 
Hoop-tire for a 4' 2" wheel:— 
iron. 
External circumf. of upper edge.. 
155*5 
147-5 
-8-0 
do do lower edge. 
155-5 
156-375 
+0-875 
Bevel of face . 
90° 
69° 
-21° 
2 b 
Wrought- 
20 
* 
12" cylinder, 9" deep and thick:— 
iron. 
Internal circumf. of upper edge. 
37-6 
37-6 
0-0 
do do contraction. 
37-6 
32-1 
—5-5 
do do lower edge . 
37-6 
37-0 
-0-6 
Depth, perpendicular . 
9-0 
8-8 
—0-2 
do on curve, external . 
9-0 
9-15 
+0-15 
do do internal . 
9-0 
9-35 
+0-35 
2 C 
Wrought- 
20 
12" cylinder, 6" deep and thick 
iron. 
Internal circumf. of upper edge. 
37-6 
36-9 
-0-70 
do do contraction. 
37-6 
32-35 
-5-25 
do do lower edge. 
37-6 
37-9 
+0-30 
Depth, perpendicular . 
6-0 
6-7 
—0-30 
do on curve, external.. 
6-0 
6-05 
+0-05 
do do internal. 
6-0 
6-30 
+0-30 
3d 
Wrought- 
10 
* 
12" cylinder, 9" deep, thin sheet:— 
iron. 
External circumf. of upper edge. 
38-40 
38-40 
0-00 
do do contraction. 
38-40 
34-90 
-3-50 
do do lower edge. 
38-40 
38-45 
+0-05 
Depth, on curve. 
9-00 
9-15 
+0-15 
4« 
Wrought- 
20 
a 
12" cylinder, 9" deep and ¥ thick:— 
iron. 
External circumf. of upper edge. 
40-90 
38-80 
-2-10 
do do contraction. 
40-90 
35-00 
-5-90 
do do lower edge. 
40-90 
40-00 
-0-90 
Depth, perpendicular . 
9-00 
8-80 
—0-20 
do on curve, external. 
9-00 
9-00 
o-oo 
do do internal. 
9-00 
9-35 
+0-35 
4 f 
Wrought- 
20 
a 
3 
12" cylinder, 6" deep and ¥ thick:— 
iron. 
External circumf. of upper edge. 
40-8 
37-2 
-3-6 
do do contraction. 
40-8 
36-2 
-4-6 
do do lower edge. 
40-8 
4015 
—0-65 
Depth, perpendicular.' 
6-0 
6-0 
0-0 
do on curve, external. 
6-0 
6-05 
+0-05 
do do internal. 
6-0 
6-15 
+0-15 
5s 
Wrought 
15 
i 
3'' cylinder, 6" deep, solid :— 
iron. 
Circumference, upper edge . 
9-4 
9-3 
—0-1 
do contraction. 
9-4 
8-95 
—0-45 
do lower edge . 
9-4 
8-95 
—0-45 
Bulge on upper end . 
0-00 
0-04 
+0-04 
do lower end .. 
o-oo 
0-15 
+0-15 
6 h 
Wrought- 
15 
2l 
3 
3" cylinder, 6 deep, solid :— 
iron. 
Circumference, upper end . 
9-40 
9-35 
—0-05 
do contraction .. 
9-40 
9-00 
—0-40 
do lower edge . 
9-40 
9-05 
-0-35 
Bulge on upper end. 
0-00 
005 
+0-05 
do lower end. 
0-00 
0-20 
+0-20 
a The width was unaltered, and the thickness of the upper edge slightly increased. Figs. 1 and 2. 
b Fig. 4. c Fig. 5. «» Fig. 6. e Fig. 7. f Fig. 8. 
s The fibre opened at the fifteenth cooling. Fig. 9. 
h The fibre opened at the fifteenth cooling after having exhibited a slight crack for two or 
three previous coolings. Fig. 10. • 
