THE ROYAL ARTILLERY INSTITUTION. 
113 
breech piece, a B tube, a trunnion ring, and 7 coils—ten distinct parts which 
are shrunk on separately. Whereas the F construction has only two 
separate parts or shrinkings, viz. the B tube and the breech coil. Some 
of the earlier Fraser guns have a breech piece, but as this appeared super¬ 
fluous with a solid-ended steel barrel, the simpler construction given in the 
example, was approved, and is the one on which all our heavy guns are now 
built. 
The following table gives the details of our wrought-iron rifled guns of 
each construction. 
TABLE 
SHOWING- DIMENSIONS, RIPLING, &C., OP WROUGHT-IRON MUZZLE-LOADING RIPLED GUNS, 
Length of 
R 
rifling. 
CO 
^03 
Radii for 
sighting. 
« 
o . 
43 O W 
■ 
o 
& 
d 
1 
Cha 
rge. 
Nature, weight, and 
a 
Q m 
P m 
* rn 
ew 
O 
o3 
g 
service. 
Gun. 
Bore. 
Rifling 
1 System.: 
Spiral, 
I 1 turn in 
| of calibr 
o <2 
|a 
O 
CD 
Side. 
Centre. 
go- 
a* 
Weight 
jectile. 
1 
a 
& 
Service. 
1 
e3 
m 
ft. 
in. 
in. 
in. 
in. 
in. 
lbs. 
cwt. 
lbs. 
lbs. 
13*05 // of 23 tons (ori¬ 
Unif. 
ginal construction).* 
14 
1 
141-5 
126- 
W 
1 in 55 
N. 10 
45 
45-1 
vertical 
600 
50 
70 
cals. 
D. -2 
. 40 
12" of 23| tons (origi¬ 
of 13" 
W. 1-5 
^ rd 
O bJO 
nal construction).... 
14 
31 
145- 
127- 
// 
b 
N. 9 
— 
— 
— 
_ 
§ § . 
50 
70 
12" of 25 tons (F con¬ 
D. -2 
W. 1-5 
| 
| g « 
struction).!. 
14 
Si 
MS- 
127- 
n 
b 
N. 9 
D. -2 
— 
— 
— 
— 
° *H g 
50 
70 
In.fr.l 
W. 1-5 
.... 
11" of 23 tons. 
14 
1 
MS- 
MO- 
inlOOto 
_ 
_ 
_ 
_ 
_ 
P4 to 
ft o a 
1 in 45 
D. -22 
8 
do to 
W. 1-5 
10" of 18 tons. 
14 
2 
145-5 
118- 
u 
1 in 40 
N. 7 
1 54 
•54 
1° 16' 
400 
40 
60 
9" of 12 tons L.S. and 
• . 
In.fr.O 
D. -2 
S.S. (original con¬ 
to 
W. 1-5 
struction) .J . 
12 
3 
125- 
107-5 
n 
1 in 45 
N. 6 
45 
45-1 
44' 
250 
Nil 
30 
43 
D.-18 
9" of 12 tons (F con¬ 
W. 1-5 
struction). .. 
12 
3 
125- 
107-5 
it 
n 
N. 6 
45 
45-1 
44' 
250 
5 
30 
43 
D. -18 
W. 1-5 
* Only two in tlie service. 
f The E or Eraser construction, is now the service construction. 
I The service charge for a M.L. R. gun is about ^th the weight of the projectile, and the battering 
charge Ath. 
a Woolwich. 
b Increasing, from 1 in 100 at breech to 1 in 50 at muzzle. 
