First a shell is fired at "long"
range, possibly the maximum range of the gun. It bursts at D.
As it has burst immediately in the line of sight of B, but with
the smoke obscured by the figure of the balloon C, it is obvious
to B that the explosion has occurred behind the objective, but at
what distance he cannot tell. To O1 and O2,however, it is seen
to have burst at a considerable distance behind C though to the
former it appears to have burst to the left and to the second
observer to the right of the target.
Another shell, at "short" range, is now fired, and it bursts at
E. The explosion takes place in the line of sight of B, who
knows that he has fired short of the balloon because the latter
is eclipsed by the smoke. But the two observers see that it is
very short, and here again the explosion appears to O1 to have
occurred to the right of the target, while to O2 it has evidently
burst to the left of the aerostat, as revealed by the relation of
the position of the balloon to the bursting of the shell shown in
Fig. 3.
A third round is fired, and the shell explodes at F. In this
instance the explosion takes place below the balloon.
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