THE ROYAL ARTILLERY INSTITUTION. 
141 
March 13; 1861.—Barometer (32°), 30’075. Thermometer, dry, 43°■ 0 ; wet, 37 o, 0. Elastic force of 
vapour, • 142. Humidity, *51. Weight of cubic foot of air, 554*5. grs. To ascertain the initial velocity 
of a 9 lb. shell, fired with a charge of 1 lb. 2 oz. from the 12-pr. gun. 
No. of Rounds. 
Nature of Ord¬ 
nance. 
Charge. 
Projectile. 
Re¬ 
coil. 
Reading of 
Needle. 
Velocity. 
Range. 
Remarks. 
Nature. 
Dia¬ 
meter. 
1 
1 
Dis- 
junctor. 
Pro¬ 
jectile. 
At 
30 yds. 
Initial. 
r 1 
Js 
3i 5 
u 
12-pr. Arm¬ 
strong, 
No. 1,050. 
lbs. oz. 
1 2 
3*074 
lbs. oz. 
9 0 
8 4 
8 6 
8 2 
8 1 
7 9 
7 2 
6 9 
36*85 
36*90 
36*85 
36*85 
36*95 
36*65 
36*85 
102*90 
102*85 
103*75 
104*70 
103*35 
ft. 
1140*8 
1141*8 
1125*7 
1109*1 
1132*8 
ft. 
1 r 
I 1141*2 | 
J-Mean i 
j 1130*0 | 
J L 
yds. ; 
210*1 
245*1 
252*0 
247*1 
244*3 
243*0 
248*6 
Gun laid p. b. with 
spirit level. Lu¬ 
bricating wads 
used. Powder, 
A 4, Hall & Sons, 
11/7/60. Lot 2. 
* No reading. 
Ranges appear 
doubtful; pro¬ 
bably a mistake 
has been made 
in counting the 
pegs. Instru¬ 
ment used,No.32. 
March 13, 1861.—Barometer, (32°) 30*075. Thermometer, dry, 43° 0 ; wet, 37°*0. Elastic force of 
vapour, *142. Humidity, *51. Weight of cubic foot of air, 554*5 grs. To ascertain the initial 
velocity of projectiles fired from a 12-pr. Armstrong gun as a function of the weight of the pro¬ 
jectile. 
i\ 
^ ] 21 
; f24 
i I 25 
5 4 26 
27 
128 
"| 11 . 
•“So 
a 
3*074 
24 2| 
24 1 
24 14 
24 8 
24 3| 
24 5 
35 10 
36 6 
35 15* 
35 10 
35 10 
35 15 
47 12 
48 3* 
47 8 
47 8 
21 1 
7 
19 2 
19 6 
21 9 
27 6 
Im¬ 
peded. 
27 8 
26 0 
36*70 
36*90 
36*95 
36*95 
36*80 
36*75 
36*75 
36*70 
36*85 
36*70 
36*30 
36*90 
36*70 
36*85 
36*75 
36*40 
36*55 
36*50 
36*70 
36*75 
36*60 
36*65 
83*20 
33*50 
33*25 
33*30 
93*60 
94*25 
98*55 
97*80 
97*75 
98*45 
98*40 
98*70 
123*10 
122*70 
122*85 
121*10 
121*80 
122*95 
113*40t 
115*05 
114*10 
114*20 
113*85 
123*95 
123*20 
121*75 
121*25 
122*75 
ft. 
1321*6 
1328*1 
1314*7 
1330*9 
1315*9 
1223*6 
1238*9 
1237*1 
1225*6 
1226*6 
1212*7 
845*5 
850' 
848*5 
870*2 
861*5 
847*3 
726*0 
708*8 
721*2 
720*1 
723*8 
625*5 
605*8 
618*0 
622*3 
ft. 
1336*3 
Mean i 
1322*2 I 
l 
1237*2 
Mean 
1227*4 
856*7 
Mean 
853*9 
721*5 
720*0 
614*8 
613*9 
yds. 
292 
294 
291 
327 
300 
315 
200 
190 
201 
205 
205 
201 
170 
163 
206 
209 
211 
208 
110*0 
115 *0 
107*0 
Gun laid p. b. with 
spirit level. Lu¬ 
bricating wads 
used. Ranges 
appear errone¬ 
ous, and are 
evidently care¬ 
lessly taken. 
Powder used, A 4, 
Hall and Sons, 
11/7/60, Lot 2. 
The powder used 
for rounds 6 to 
11 is supposed to 
be the same; but 
this is not cer- 
tain. 
t Screens 
90 ft. 
apart. 
Carriage 
broke 
down. 
Gun 
mounted 
on old 
9-pr. carriage. 
Carriage 
broke 
down. 
March 13, 1861.—Barometer (32°), 30*075. Thermometer, dry, 43°*0; wet, 37°*0. Elastic force of 
vapour, *142. Humidity, *51. Weight of cubic foot of air, 554*5 grs. To ascertain the initial 
velocity of a 9-lb. shot fired from the service field gun. 
lbs. oz. 
At 
ft. 
lbs. 
oz. 
0 
° 
25 yds. 
yds. 
Gun laid p. b. 
f J 
eS 
0 14 
4*08 
9 
5 
2 11 
35*60 
— 
— 
209*0 
Ht. of line of axis 
SJ 
1 2 
=< bo -5 
„ » 
o 
4*08 
9 
6 
2 10 
36*00 
92*50 
1004*9 
200*0 
of gun, 3' 111". 
I 3 
« * 
,, „ 
4*08 
9 
5 
2 9 
36*20 
93*30 
991*0 
j 1011*2j 
— 
Powder W. A. 
Hi ! 
l 4 
„ 
4*08 
9 
5 
2 9 
36*30 
90*70 
1037*6 
200*0 
Lot 260. Screens 
fcjj 
r 5 
1 8 
4*09 
9 
5 
4 5 
33*20 
75*15 
1320*6 
) Mean ( 
C.1310*9l 
275*0 
90 ft. apart. 
6 
„ „ 
0 
o 
4*08 
9 
6 
4 3 
33*20 
75*40 
1313*2 
269 
H) I 
l 7 
o>*3 
” ” 
4*08 
9 
5 
4 5 
33*40 
75*90 
1298*8 
115 
