ARMOUR-PIERCING PROJECTILES, 
505 
were almost all broken up, even those which struck on holes already 
made, or on the edges of the plates, and they broke up into very small 
fragments, which were much heated. 
The steel plates ended by falling to pieces, and with the exception 
of one Marrel plate, the wrought-iron plates were never cracked. 
Table I .—Practice with long 17 cm hooped Krupp Gun. 
No. of 
round. 
Nature or plate. 
Effect produced on plate. 
Effect on 
projectile. 
Remarks. 
Projectile stuck in plate, 
A piece broken 
No cracks in 
the base sunk to depth of 
off the base. 
plate. 
Cammell's plate, iron, 
ll cm (4-331 ins.) 
10 > 
placed vertically, A 
These projectiles struck 
— 1 
9-921 ins. thick. f 
corner of plate, broke off 
a piece, and went obliquely 
through backing. 
Ik 
J 
2 ] 
Marrel’s iron plate placed 
Through plate and buried 
in backing, base sunk 4 cm 
Base unbroken.* 1 ) 
Plate penetrated, 
but there are 
no cracks. 
c 
vertically, 10 ins. thick. 
(1-575 ins.) 
C 
9) 
Through plate and most of 
backing, base sunk to 42 cm 
Base broken. J 
(16-535 ins.) 
6 
Marrel’s iron platelOins. 
Stuck in plate, the base 
A piece broken 
No cracks in 
thick placed horizontally. 
projecting l cm (0*394 in.) 
off base. 
plate. 
1 
Brown’s iron plate 
9-842 ins. thick, placed 
Struck corner of plate, 
went through it, backing, 
and broke balk. 
Shell broke up, 
fragments found 
behind target. 
— 
horizontally. 
Through plate and backing 
<_ 
No cracks in 
plate. 
3*) 
Point of projectile through 
plate. 
Shell broke up and 
Plate is split 
( 
Duus’ steel plate 9-213 ins. 
fragments re¬ 
transversely. 
C 
thick placed vertically. 
Do do 
bounded from trgt. 
8; 
Do 
Do 
4 
Do do 
Do do 
Shell rebounded 
Plate is cracked 
placed horizontally. 
whole. 
in many direc¬ 
tions. 
