670 
EXPERIMENTS AT MEPPEN. 
3. The soft steel shell, as might have been expected, had set up 
before breaking. The vis viva was also less than that of the 3^ calibre 
shells, so that its effect, even under favorable conditions, would not 
have been so great; as compared to chilled shells, however, the effect 
was much greater, and for chilled shells of the same weight only made 
indents of from 3*94 inches to 4*33 inches, whereas the soft steel shell 
nearly penetrated the 8-inch plate. 
4. In direct impact, the 12-inch pla.te was perforated, with some 
energy to spare, by the 15 cm sfceel shell, with a striking energy of 
126*25 ft. tons per inch of circumference. 
5. The 8-inch plate was perforated, with considerable surplus energy, 
at a striking angle of 55°, by the 15 cm steel shell, with a striking 
energy of 127 ft. tons per inch of circumference. 
DatCi 
Gun. 
N umber of round. i 
Charge, 
7 hole 
prismatic. 
i 
13 
CD 
*5" 
Ph 
Velocity at 
100“ (109 yds.) 
from muzzle. 
Pressure 
tons per 
square 
inch. 
Energy. 
Chrono¬ 
graph. 
Mean. 
Weight. 
Density. 
Rodman 
apparatus. 
Crusher 
gauge. 
No. 
292 
No. 
293 
lb. 
28*6 
ft. tons. 
27. 2. 80. 
Long 15 cin gun, 
1 
37 48 
.070 
Steel 
1739 
1739 
1739 
19*91 
20-41 
2341 
No. 283. 
V 4 
shell. 
Calibre, 5’87 inches. 
2 
a 
| 
3|- cals. 
1720 
1731 
1725-5 
19-89 
20-47 
2303 
Length of bore, 
long, 
148"9 inches. 
3 
n 
11 
lll-641b. 
1749 
1752 
1750-6 
20-28 
20*87 
2373 
Length in calibres, 
— 
— 
— 
— 
— 
25-4 inches. 
Mean 
1736 
1741 
1738 
20*03 
20-59 
2340 
6. 3. 80. 
a 
4 
n 
11 
Steel 
1906 
1908 
1907 
18-97 
18-45 
2154 
shell, 
2-8 cals. 
long. 
85-43 lb. 
A. Direct fire at a 12-inch wrought-ir onplate from the Dittinger Works. 
Kange, 164 yds. 
1. Striking velocity ... .. 1726 f.s. 
„ energy ... ... 2308 ft. tons. 
Plate perforated . Hole 5*99 inches X 6”34 inches. 
Struck 15’75 inches from left, 13*8 inches from top of plate vertical 
through ciack; 79 inches wide at top, from top of hole to top of 
plate. 
In rear. —Moulds broken away over 17 inches X17 inches to a 
maximum depth of 3’86 inches. 
The shell was picked up 33 yards in rear of plate, the point was warm. 
It had set up ”21 inch in length, and from *04 inch to ”05 inch in 
diameter. 
