506 ARMOUR-PIERCING PROJECTILES. 
Table IT, — Practice with 9-in. Rifled M.L. Armstrong Gun , 
No. of 
round 
Nature of plate. 
Effect on plate. 
Effect on 
projectile. 
Remarks. 
4 
2 ' 
3 
7J 
6 
9, 
8 
10 
Duus’ steel plate, vertical 
9*213 ins. thick. 
Duus’ steel plate, hori¬ 
zontal 9*213 ins. thick. 
Marrei’s iron plate placed 
horizontally, lOins 
thick. 
Marrei’s wrought-iron 
plate placed vertical, 
lOins. thick. 
Brown’s wrought-iron 
plate, horizontal, 
9*842 ins. thick. 
Cammell’s iron plate, 
vertical 9*921 ins. thick. 
Struck an old hole, went through 
plate hacking, and overturned 
the structure; plate useless. 
Struck upper edge of plate, 
went through backing and 
set it on fire ; plate useless. 
Struck lower edge of plate 
went through backing 
and upset supports. 
Struck high on right, did 
not penetrate,* point 
buried in plate. 
Struck high on left, went 
through backing, and 
upset supports. 
Struck right lower edge of 
plate, did not penetrate, 
point buried in plate. 
Struck left lower edge of 
plate, near old hole, and 
penetrated backing. 
Point remained buried in 
plate. 
Struck left upper edge of 
plate, and penetrated 
plate and backing. 
Struck lower edge of plate 
and did not penetrate. 
Broke into small 
S ;s found be- 
target. 
Broke up, pieces 
fell behind target 
Broke up, pieces 
rebounded. 
Broke up. 
Broke up. 
Broke up. 
Plate cracked in 
many places. 
Do 
No cracks. 
One crack in 
plate. 
No cracks. 
Do 
Do 
Do 
Do 
Do 
