254- 
MINUTES OF PROCEEDINGS OF 
Table Y. 
“ Secretary, Woolwich, 21.6.71, submits the results of practice carried out at Shoeburyness, 
8-9. 6. 71, for determination of range and accuracy of the undermentioned guns. 
Expl. No. 390. Expl. No. 385. 
Calibre... Scinches. 3*6 inches. 
(of bore. 68-4 „ 68’44 „ 
Length 4 of rifling. 65-54 » 63-44 „ 
(.nominal . 74-7 » 74-6 n 
("number . 3 3 
r grooves ■< width . 0-8 n 0-8 „ 
Rifling... ■< (.depth . 0-11 „ O'll „ 
(.spiral, uniform. 1 in 25 cals. 1 in 30 cals. 
Preponderance. 3 lbs. 4 lbs. 
Weight. . . 12 cwt. 1 qr. 141bs. 11 cwt. 3 qrs. 41bs. 
Steel and hardened copper. 
Hardened copper. front vent, 4 f 4 ins. | from enc 
Vent ...... 0*6 in. from end of bore. rear » 0*6 in. ) of bore. 
Common shell, with ( diameter. 3 -24 ins. 
2 rows of brass ■< length. 11-3 ,i 
studs, 3 in a row. (.weight, filled. 16 lbs. 
3-54 ins. 
10-0 „ 
16 lbs. 
Charge, 3 lbs. 
Powder, R.L.G., W.A., lot 1637. 
Direction 
<-6 
o 
1> ri 
Mean 
Mean 
Ranges. 
Mean 
Mean deflection. 
and force 
Gun. 
time of 
difference 
* OQ 
£ S3 
recoil. 
of wind. 
O 
£5 s 
& > 
flight. 
of range. 
Ob¬ 
Re¬ 
£ 
O 
u 
o ® 
Min. 
Max. 
Mean. 
served. 
duced. 
( 3-3-in. y 
O / 
ft. ins. 
secs. 
yds. 
yds. 
yds. 
yds. 
yds. 
yds. 
—■5- 3-5 
\ Expl. No. 1 
20 
2 5 
18 2c 
3-0 
1007 
1126 
1057 
21-9 
5-3 
0-5 
(. 390. ) 
a 
_^3 
it 
20 d 
5 3 
6-6 
b 
2120 
2216 
2172 
20-2 
20-0 
1-7 
2-3 
n 
20 
10 2 
12-0 
3515 
3692 
3619 
30-3 
47-0 
2-4 
( 3-6-in. \ 
8 
b 
_2 
1 Expl. No. \ 
C 385. ) 
20 
2 5 
) « 
CO 
1152 
1208 
1187 
13-2 
4-1 
0-8 
_ ^ 2 
" 
20 
5 3 
6'7 
2167 
2296 
2228 
21-0 
17-5 
1-2 
\ 3 
V 
20 
10 2 
12-1 
3530 
3640 
3596 
27-3 
50-1 
3-0 
a 
a Mean of 18. b Mean of 19. c Mean of 4. d One broke on graze on sands. 
“Special Committee, 10. 6.71, recommend the adoption of a 16-pr. gun of 3-6ins. calibre, of 
about the same Aveigbt as the experimental gun (but not less than 12 CAvt.), the same preponderance, 
the same system of rifling, but beginning at 10-36ins. from bore; axis of vent 0'6in. from end 
of bore.” 
Commenting on the figures in the above table, the author of “ Flat 
Trajectories” (page 81), says :—- 
“ There is a manifest discrepancy in the ranges of the S’o-in. and 
3‘6-in. guns for 2° 5' elevation (see table). By calculation it may be 
shown that the correct range for the 3*3-in. gun at 2° 5' elevation would 
be about 1057 yds.—the same as that determined by experiment; also, 
the correct range for the 3'6-in. gun at the same elevation would be 
about 1087 yds.— i.e., 100 yds. less than that determined by experiment. 
It can only be accounted for from the fact of the 3’3-in. gun being 
allowed to recoil, while the recoil of the 3‘6-in. gun at the same eleva¬ 
tion was checked.”* 
Proceedings of Department of Director of Artillery,’ VoL IX. p. 118/ 
