PRINCIPLES QP GUNNERY, 
463 
With concrete the surface is more broken up than with masonry, concrete, 
Concrete generally breaks up in layers, but it is superior to masonry 
in resisting penetration. 
The following table gives the penetration into brickwork and con¬ 
crete, from experiments carried out at Eastbourne in 1876 j—- 
Material of 
target. 
Nature of 
ordnance. 
Projectile. 
Charge. 
Range. 
Penetration. 
Nature. 
Weight. 
lbs. 
lbs. 
yds. 
Brickwork 
64-pr. M.L.R. 
common shell 
64 
10 
1000 
3 ft. 2 ins, to 5 ft. 
// 
n 
battering shell 
89 
12 
a 
C Perforated 7 ft. 
1 of wall. 
Concrete 
a 
II 
II 
10 
100 
4 ft. 8 ins. 
II 
n 
common shell 
64 
ii 
II 
2 ft, 6 ins, 
II 
a 
n 
n 
12 
1000 
4 ft, 
Granite and") 
1" Perforated 11 ft. 
Portland ce- > 
12 - 5-in. M.L.R. 
Palliser shell 
822 
130 
70 
< and destroyed 
raent concrete ) 
(_ the wall, 
[To be continued ,) 
