THE ROYAL ARTILLERY INSTITUTION. 
143 
Same date and circumstances as before. Experiments to ascertain the effect of diminishing the lead on 
the base of the 12-pr. Armstrong projectile. 
•3 
ft 
S3 
A 
o 
Projectile. 
Reading of 
Needle. 
Velocity. 
Re- 
o 
si 
Nature 
nance. 
Charge. 
Nature. 
Dia¬ 
meter. 
£ 
1 
coil. 
Dis- 
junctor. 
Pro¬ 
jectile. 
At 
30 yds. 
Initial. 
KiSlllgC. 
MARKS* 
lbs. oz. 
lbs. oz. 
o 
o 
ft. 
ft. 
yds. 
^Segment shells 
ari 
1 8 
— 
3*074 
11 9 
6 9 
30*75 
92*45 
1205*3 
^ 1248'2 ( 
> Mean < 
j 1238*3 £ 
289*3 
i 
— 
8 6 
30*70 
90*45 
1244*4 
265*3 
) fired under nor¬ 
Ml 3 
O 
55 55 
— 
7 6 
30*75 
90*60 
1241*4 
312*3 
mal circum- 
t-1 1^ 4 
o 
_ 
8 5 
30*60 
90*75 
1229*0 
315*0 
i 
l stances. 
rH 
55 55 
i 
f Same shell turned 
• 
i 
I down to the dia- 
M f 5 
sl 
_ 
3*01 
8 3 
30*75 
93*70 
1183*7 
b 1209*7 ( 
269*0 
l 
| meter 3*01 ins., 
^Mean 4 
i 
| with the excep¬ 
31 6 
ih 
— 
8 0 
30*89 
91*95 
1216*8 
J 1200*2 1 
— 
tion of a ring 
S3 
1 
about 25 ins. at 
8 
L base. 
d f ^ 
a 
55 55 
_ 
55 
55 
_ 
30*95 
94*90 
1161*9 
) 1172*8 ( 
— 
X J 
si« 
<3 
£-* 
55 55 
— 
55 55 
— 
30*80 
94*70 
1165*5 
> Me in 4 
) 1163*7 ( 
293*6 
Same shell turned 
down through¬ 
B f 9 
m<! 
ft 
„ „ 
- 
” 
» » 
30*90 
99*75 
1080*4 
1097-9 C 
/-Mean < 
245*3 
out to the dia¬ 
meter 3*01 ins. 
M L io 
„ „ 
— 
„ „ 
— 
30*95 
98*60 
1098*8 
) 1089*6 ( 
266*0 
i 
i 
Powder, A 4, Hall 
and Sons, 11/7/60. 
Lot 2. Last 2 
rounds a different 
powder, A 4,W- A. 
5/9/60. Lot 288 
were used. 
No. 12. 
October 17, 1860.—Barometer (32°), 30*090. Therm, dry, 51°*5; -wet, 47°*4. Elastic force of vapour, 
*273. Humidity, *72. Weight of cubic foot of air, 544' 7 grs. To ascertain the difference, if any, in 
initial velocity or regularity between two Armstrong guns, one of which had been exposed for several 
weeks without protection to the weather. 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
15 
12-pr. Armstrong, No. 8. 
Weight, 8 cwt. 2 qrs. 13 lbs. 
lbs. oz. 
1 8 
3 
*© 
£ 
ft) 
© 
g 
as 
3*085 
lbs. 
11 
oz. 
9 
1 1 l 1 1 \f 1J l ■T l II 1 
41*40 
41*40 
41*45 
41*60 
41*55 
41*50 
41*55 
41*50 
41*60 
41*45 
41*50 
41*70 
41*50 
41*65 
109*55 
108*40 
108*10 
108*30 
108*80 
108*75 
109*00 
109*20 
109*10 
109*15 
109*10 
109*25 
109*15 
109*10 
ft. 
1115*2* 
1136*0 
1136*0 
1137*9 
1128*7 
1129*6 
1125*2 
1122*7 
1124*5 
1123*6 
1124*5 
1121*8 
1123*6 
1124*5 
J 
ft. 
1136*3 
-Mean « 
1127*6 
l 
yds. 
255*0 
265*0 
265*0 
264*0 
262*0 
260*0 
256*0 
260*0 
257*0 
262*0 
268*0 
269*0 
268*0 
260*0 
259*0 
This gun had been 
exposed (without 
being touched) 
to the weather 
for several weeks. 
It appeared to 
have been well 
greased. It was 
fired without 
being cleaned. 
Therewasno diffi¬ 
culty in working 
it. Lubricating 
wads were em¬ 
ployed. Powder, 
A4. Gun mounted 
on field carriage. 
* Not included in 
the mean. 
16 
1 
8 
3-085 
11 
9 
_ 
41*65 
108*95 
1128*6* 
r 
310*0 
This gun was new 
17 
S'ji 
55 
55 
n 
— 
41*50 
108*15 
1143*4 
312*0 
and very clean. 
18 
55 
© 
55 
— 
41*60 
108*05 
1145*3 
311*0 
Lubricatingwads 
19 
6 rH 
55 
55 
„ 
— 1 
41*60 
107*95 
1147*1 
300*0 
used. 
20 
fc « 
,60 
— 
41*50 
107*80 
1150*0 
269*0 
* Not included in 
21 
fee & 
*© 
— 
41*75 
108*40 
1136*9 
282*0 
the mean. 
22 
55 
55 
— 
41*50 
108*25 
1139*7 
1150*6 
310*0 
23 
o . 
£-43 
r 
*© 
— 
41*50 
108*35 
1137*9 
-Mean.- 
287*0 
24 
■g * 
55 
— 
41*50 
108*65 
1132*3 
1141*8 
286*0 
25 
a ° 
9 
55 
43 
55 
55 
— 
41*60 
108*45 
1136*0 
310*0 
26 
m 3 - 
55 
s- 
© 
55 
55 
— 
41*45 
108*05 
1145*3 
296*0 
27 
s-*4=! 
55 
S 
55 
— 
41*50 
107*40 
1155*6 
300*0 
28 
ft.OJO 
55 
a? 
55 
— 
41*45 
■ — 
— 
320*0 
29 
££ 
55 
m 
55 
— 
41*50 
108*05 
1145*3 
282*0 
30 
F 
” 
„ 
55 
” 
” 
— 
41*50 
108*80 
1129*6 
1 
268*0 
