82 
SHORT NOTES ON PROFESSIONAL SUBJECTS. 
Dry fir ,—2 planks as above, 
Henry through both. 
Others, through one and lodged in two, the Snider small bore giving the deepest 
penetration. 
At 100 yards, 3 planks as above:— 
Henry through all. 
4 planks as above (3 dry, 1 green):— 
Henry through all. 
Gabions .— Ordinary, filled with stiff clay taken from the P roof Butt, 
Royal Arsenal. 
Rifles used. — Henry, Snider service (0*577 in,), and Snider 
small bore (0*5 in.). 
At 50 yards, proof against all. 
n 25 yards, n except Henry, which sometimes passed through. 
it 10 yards, » 11 ir n 
Jones 3 s iron gabion, filled as above, 
At 10 yards, proof against all. 
Sap roller*—Length 7 ft., total diameter 4 ft., thickness 11^ ins. 
At 50 yards, proof against all. 
n 25 yards, n except Henry occasionally. 
n 10 yards, n ii ii 
A sand bag, containing a bushel of sand, about 12 ins. thick, 
rifles as before. 
3?roof against all at 10 yards, except the Henry, which occasionally passed through. 
Parapet of stiff earth, 3 ft. thick, on superior slope. 
IProof against all at 10 yards. The Henry penetrated 21 inches. 
A rope mantelet consisting of 4 thicknesses of 3-inch rope, 
rifles as before. 
At 400 yards, proof against all. 
n 350 yards, Henry sometimes through. 
ii 300 yards, Henry through, proof against the others. 
ii 50 yards, Snider small bore through in pieces, proof against service Snider. 
Complete perforation depended in some measure on the particular part of the 
mantelet struck. Thus, when hit in the interstices between the ropes the pene¬ 
tration was greater; the mantelet, however, was not considered satisfactory, and a 
new one was subsequently demanded. 
