THE EOYAL AETILLEEY INSTITUTION. 
41 
THOENEYCEOFT’S EIGHT AND TEN-INCH IEON BAES. 
June 6,1861. 
The 1st target was formed of Thorney croft bars, secured by dovetails to 
the iron uprights; the dovetails were rolled on the back of the 1st, 8th, 12th, 
19th, and 21st bars. The bars were 10-in. by 4-in., and 12ft. long; tire 
iron uprights were 2^ ft. apart. 
The 2nd target was formed of similar bars, 8-in. by 3f-in., supported in a 
similar manner with iron uprights, the end ones being supported by masonry. 
The Thorney croft Independent Shield, Bars 10 in. by 4 in. 
1 
Cm 
O 
6 
6 
Nature 
1 
Ordnance. 
Charge, lbs. 
Weight of 
Projectile,lbs. 
Nature of 
Projectile. 
Eange, yds. 
Elevation. 
Deflection. 
Eemarks. 
2 
68-pr. 
95 cwt. 
16 
66| 
cast-iron 
round shot. 
400 
ip 
2 
Hit the right face just at the mouth of the embrasure 
on the 4th bar above the sill; made an indent 7-in. 
in diameter. Three of the bars driven back 3-in., 
two more bars 2-in. The tongue of the bars where 
struck sheared off. 
3 
Passed through the embrasure. 
4 
Struck the lower bar on its lower edge; scooped out a 
hemispherical piece 2^-in. in depth, 7-in. in diameter; 
tore away some of the wooden foundation. 
5 
Struck 20-in. to the left of the last round. Exactly 
the same effect. 
6 
Hit the left top of the target on the 7th and 8th bar 
from the top; diameter of indent 9^-in., depth If-in. 
The back of the 8 th bar which, owing to the dove¬ 
tail on the back was 12^-in. in thickness, was cracked. 
The bars did not appear to be displaced. 
7 
... 
Through the embrasure. 
8 
To the right and 13-in. from the mouth of the embra¬ 
sure on the 13th and 14th bars; diameter of indent 
9-in., depth 1-64-in. 
9 
100-pr. 
14110 
cast-iron 
400 
30' 
6'E 
Through the embrasure. 
10 
Armstrong 
solid shot, 
hemisphe¬ 
rical head. 
38' 
Hit the foot of the second upright below the bars; 
broke away 3! ft. of the bar, tore away the part that 
formed the dovetail between 19th and 21st bars, and 
drove the top of the target 6-in. forward. 
11 
46' 
Struck the 5th bar from the top; diameter of indent 
8!-in., depth 1-68-in.; cracked the bar. 
12 
Hit the 10th bar from the top; opened a crack right 
through the bar one inch wide. The left upright 
was cracked right through at the second dovetail 
from the top. The tongue of the bar where struck 
was sheared off for several inches. Indent 2-12-in. 
13 
120-pr. 
shunt gun, 
muzzle 
loader. 
18 
126 
cast-iron 
solid shot, 
hemisphe¬ 
rical head. 
400 
33' 
Hit the 3rd bar from the top; broke away 2 ft. 9-in. 
of the bar, and drove it ten yards to the rear of the 
target; opened the three top bars 1^-in. each, stripped 
off the top part of the first dovetail on the second 
upright; opened the crack on the first upright 2|-in 
wide. Indent 2-20 in. 
The target fell on its face. 
The Thorney croft Embrasure, supported by Masonry. The bars were 8 in. by Bf in. 
1 
68-pr. 
16 
66! 
! cast solid 
400 
io 
2 
Hit on the 3rd and 4th bar below the sill of the em¬ 
brasure ; drove a piece 7! by 4! by 2|-in. from the 
back of the 3rd bar; diameter of indent on the face 
9-in., depth 2-in. 
2 
Hit on the left of the embrasure on 17th, 18th, and 19th 
bars; made an indent 9-in. in diameter, If-in deep, 
and cracked the bar. 
3 
Hit almost exactly on the same spot as No. 2, made a 
crack across all three of the bars 2!-in. wide, the bars 
were driven 2f-in. into the mouth of the embrasure. 
The masonry was much shaken. 
4 
100-pr. 
14 
110 
cast solid 
400 
46' 
6'E 
Hit just over one of the iron upright supports, which 
it drove away, tearing away the slots made to re¬ 
ceive the dovetails on the back of the bars, and 
breaking it into three pieces; cracked the bar where it 
struck, crack 2-in. wide. Indent 2*8-in. 
[VOL. in.] _ _ _6 
