14.4, THE INFLUENCE OF AMMUNITION ON SHOOTING. 
that in order to burst the 15 Ib. shell 80 yards short of the target the 
fuze was set to burn for 4°74 secs. We now have to investigate where 
the 15:1 lb. shot would burst, with its fuze set to burn for 4°74 secs. 
Briefly it would burst 80-2 yards short of the target, at aheight above 
plane of 19°18 feet. The respective trajectories and points of burst 
are best set out on the accompanying diagram, which is, of course, in 
no way to scale. 
ARGET 
sh <3.2x> 
x 
It would be difficult to distinguish any practical difference in the 
effect of these two shrapnel. To detect the different positions of their 
burst would require exceptional powers of observation. 
The shght effect of difference in weight of shell on the shooting may 
seem somewhat surprising. With the view of further checking the 
above result, I have calculated the trajectories for these two shell 
when fired at an elevation of 7° 14’. This elevation corresponds in the 
range table to a range of 38500 yards. ‘he calculated result for the. 
15 Ib. shell is 3470 yards. This result gives an error of less than 86°/, 
and is therefore sufficiently close for the purposes of comparison. The 
results of the two shells are set ont in the following table :— 
Weight of shell. z Time of flight. Remaiting {Angle of descent. 
Ibs. Hanes Warne SCCS. velocity. Degrees. 
15 3470 10:01 821-3 10°941° 
16:1 3468 9:999 82405 | 10:901° 
In this case the ranging is practically the same for both shells. If 
fuzes are set to burst the 15 lb. shell 70 yards short of the target, the 
15:1 lb. shell would burst some 62 yards short. 
It is possible that a slightly wider difference in weight than I have 
assumed may be found, but it does not appear that the effect on the 
shooting will be of importance. It must be borne in mind that weight 
of shell is a comparatively easy matter for the manufacturer to 
regulate. That being so any shell which is found in the service may 
be fired without anxiety as to its weight. 
Variations in the shape of head, position of centre of gravity, etc., 
undoubtedly affect the shooting. Such considerations are outside the 
range of practical artillery, and under service conditions difficult, if not 
impossible, to allow for. Shell can only pass into the service if with- 
