THE ROYAL ARTILLERY INSTITUTION. 21 
Table II. 
ANGES OF 40-pr. GUN CORRECTED FOR THE DIFFERENT HEIGHTS OF THE 
AXIS, AND REDUCED TO THE TRUE ANGLE AS DEFINED ,pCLT 1. 
Elevation by T, 
Yards. 
Elevation by T. 
Yards. 
Elevation by T. 
Yards. 
o 
> 
O 
, 
0 
/ 
0 
16*5 
312 
4 
2-9 
1779 
_ 
0 
24-4 
376 
4 
5-1 
1806 
— 
0 
34-8 
492 
4 
4 . 7 # 
1873 
8 
2-9 
3186 
1 
7-6 
682 
5 
2-5 
2116 
— 
1 
12-7 
723 
5 
4-3 
2729 
9 
1*6 
3303 
1 
19-1 
783 
5 
2-8 
2274 
9 
2-6 
3562 
2 
4-9 
1061 
— 
8 
59-8 
3454 
2 
8-6 
1077 
6 
3*6 
2503 
10 
1-5 
3577 
2 
11-4 
1151 
— 
10 
2-5 
3751 
3 
3-6 
1429 
7 
1-9 
2727 
—. 
3 
6-5 
1448 
7 
3*2 
2925 
3 
7-4 
1491 
7 
0-8 
2955 
6. If the irregularities do not entirely disappear from the foregoing Table, 
it will at least be admitted that they are greatly reduced in amount; for the 
rest we must fall back on the variable circumstances of wind and weather 
attending each series. Speaking generally, the practice on the travelling 
carriage up to 5° was favoured by a moderate wind dowm the line of fire; 
above 5° the wind crossed the line of fire, and had little or no influence on 
the range. The practice on the naval carriage was made with wind crossing 
the line of fire, and the ranges will be little affected by it. The practice on 
the garrison carriage was made with a prevalence of high wind down the line 
of fire, and the ranges are beyond doubt considerably augmented by it, 
7. The practical conclusion from the whole is. 
First .—Our fundamental Range Tables should be so made out as to have 
no reference to the height of the axis of the gun, or the relative position 
of the gun and the object intended to be struck, within common or 
moderate limits. 
Secondly .—All that is requisite is, that however the recorded angles of 
elevation be obtained, the corrections shewn above be applied to make true 
angles of them, before they are combined graphically or otherwise to deduce 
Tables of mean ranges for even degrees of elevation, or of mean elevation 
for given distances. 
Thirdly .—It is to be understood that the tabular elevations mean the 
elevations proper to strike the point above which each elevation is given, 
and the gun is to be laid at that point, e.g. the centre of a target and not 
the bottom or the top, or a man's height, or any other arbitrary object. 
Fourthly .—The inaccurate practice of laying high or low to correct a 
bad shot should be avoided: the proper and only accurate course is to lay 
again at the same point but give more or less elevation, the gunner then 
* The reason the third angle here begins to he less than the second is, that the constant 
correction of — 6 ' to reduce quadrant elevations to tangent elevations exceeds the -f correction. 
