When the gun
is elevated to high angles the shell, after insertioin the
breech, is prevented from slipping out by means of a special
device, so that the proper and automatic closing of the breech is
not impaired in any way.
In such an arm as this, which is designed essentially for
high-angle firing, the sighting and training facilities require
to be carried out upon special lines, inasmuch as the objective
is necessarily at a considerable altitude above the horizon of
the gun. In other words, in firing at a high inclination,
distance between the gun and the target cannot be utilised
directly for the back sight. On the other hand, it is essential
that in proportion as the angle from the horizontal increases,
the back sight should be lowered progressively in a manner
corresponding to the distance.
To assist the range-finder in his task of sighting it is
necessary that he should be provided with firing tables set out
in a convenient form, which, in conjunction with the telemeter,
serve to facilitate training for each successive round. In this
way it is possible to pick up the range quickly and to keep the
objective in the line of fire until it either has been put hors
de combat, or has succeeded in retiring beyond the range of the
gun.
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