26 
MINUTES OF PROCEEDINGS OF 
Table VI.— Continued. 
Date. 
2 ° 
6 ° 
10 ° 
No. of 
rounds. 
Mean 
range. 
Mean 
differ. 
of 
range. 
Mean 
j deflection. 
| No. of 
[ rounds. 
Mean 
range. 
Mean 
differ. 
of 
range. 
Mean 
deflection. 
aa 
O r£ 
6 § 
fc 8 
Mean 
range. 
Mean 
differ. 
of 
range. 
Mean 
deflection. 
yds. 
yds. 
yds. 
yds. 
yds. 
yds. 
yds. 
yds. 
yds. 
40-pr. 
Charge 6 lbs. 
4/ 3/61 
10 
1059 
19*5 
0*68 
... 
... 
„ 
10 
1096 
12-8 
0*49 
9/ 9/61 
9 
1117 
21-9 
1*30 
io 
1966 
16*8 
1*00 
}f 
10 
1047 
11*8 
0*30 
10 
2032 
34*7 
2*48 
n 
... 
... 
20 
2106 
29*4 
2*33 
30/10/61 
... 
16 
2100 
36*1 
1*80 
... 
17 
2102 
18*3 
1*70 
22 / 1/62 
2*6 
1128 
16*6 
0*71 
20 
2155 
23*8 
1*83 
20 
3672 
19*5 
2*33 
24/ 1/62 
19 
1235 
17-1 
0*70 
20 
3847 
30*5 
3*78 
110 -pr. 
Charge 121bs. 
IS/ 1/61 
20 
1839 
15*7 
51*46 
14/ 2/61 
20 
1010 
20*25 
0*53 
16/ 4/61 
20 
3493 
45*46 
3*40 
24/ 6/61 
15 
3594 
42*33 
4*50 
17/ 8/61 
io 
1197 
28*60 
1*45 
io 
2309 
29*5 
4*45 
15 
3791 
61.9 
11*45 
11. It results from the foregoing Table that up to 5° of elevation, 
the average deviation of any shot from the mean range which would be 
given by a continuance of practice, under the same circumstances, varies 
between 0*007 and 0*029 of the whole quantity, or from less than one- 
hundredth to nearly three-hundredths of the actual ranges (the average is 
about *014 or one-hundredth and a half). Irregularity in the strength of the 
powder, difference in the direction and force of the wind, and many other 
causes contribute to make the range different on different occasions, but each 
shot is true within these limits, to the circumstances of the moment; and 
the second may be corrected by the first with a confidence unknown to 
smooth-bore practice. 
12. A line of troops subtends an angle of between 3 7 and 4' at 2000 yds. 
and the hull of a vessel 12 ft. out of the water, an angle of between 7' and 
8'. The height of the first allows a latitude of 20 or 30 yds. of range, and 
of the second a latitude of 60 or 70 yds. in the estimation of distance, 
and to this approximation should it if possible be ascertained. At least 
three centuries ago, Nicholas Tartaglia expressed the importance of this 
question in language not the less true for its quaintness, and as the subject 
cannot be too frequently brought before the artilleryman, I quote his words 
below. 
An trhs-illustre et trh-invincible Seigneur Francois Marie de Feltre de la Bov ere, excellent 
tissime due d’ TJrbin et de Sora, Sfc. 
“Ensuite, magnifique seigneur, j’ai considere que toutes ces diverges connaissances seraient de 
“ fort peu de secours k un artilleur, s’il ne connaissait pas la distance du lieu ou il doit faire 
