DUTCH ARMOUR-PIERCING EXPERIMENTS, 
509 
More was expected from the steel projectiles than the chilled ones. 
They were heavier, and were fired with a higher charge at the lower 
portion of the target from the steel gun, which was polygrooved, the 
projectiles being rifled by means of copper rings near shoulder and 
base, as seen in projectile in Fig. 2, whereas the chilled projectiles had 
studs, being fired from the cast-iron gun at the upper portion of the target. 
In all seventeen rounds were fired, namely, four heavy and one light 
of Ekman ; s, five heavy and three light of Griison^s, and four of Krupp's. 
The following table gives the details — 
No. of round and 
maker. 
| Weight of charge. 
| Kilogs. 
Weight of projectile. 
Kilogs. 
| Striking velocity. 
Metres. 
| Stored up work in 
| ton metres per 
| cent, of shot’s cir- 
j cumference. 
Remarks. 
1. Ekman 
16 
147-75 
266-9 
7-116 
Struck near top. 
2 . a 
„ 
152-34 
266-4 
7-311 
II 
3. ,/ 
i, 
rr 
264-7 
7-196 
Struck junction of plates. 
4. 
„ 
n 
267-4 
7-363 
Fairly through. 
5. Griison 
18 
149-65 
290-3 
8-527 
Struck close to 4. 
6 . 
n 
n 
290-3 
8-527 
Fairly through. 
7. Ekman 
i, 
152-34 
285-9 
8-416 
Struck top edge. 
8 . Griison 
n 
153"85 
287-3 
8-584 
Fairly through. 
9. 
n 
It 
288-7 
8-669 
Through. 
10 . 
16 
II 
266-3 
7-378 
Struck near top. 
11 . 
n 
II 
262-3 
7-159 
Just through (vide Fig. 1). 
12 . 
n 
II 
267-1 
7-420 
Through. 
13. n 
„ 
149-65 
271-9 
7-482 
Through weak place. 
14. Krupp 
22-3 
161 
323-0 
11-367 
Through thick portion. 
15. 
n 
n 
321-5 
11-248 
Barely through. 
16. n 
a 
„ 
322-6 
11-326 
n 
17. « 
— 
— 
— 
— 
Not given. 
63 
