The sighting arrangements of these Krupp anti-aircraft guns are
carried out upon these lines. Beneath the barrel of the
back-sight is an observing glass with an eye-piece for the
artillerist, while above and behind the observing glass is
another eye-piece, to be used in conjunction with the
manipulation of the back-sight. The eye-piece of the observation
glass is so made that it can be turned through a vertical plane
in proportion as the angle of fire increases in relation to the
horizontal. The determination of the distance from the objective
and from the corresponding back-sight as well as the observation
of the altitude is carried out with the aid of the telemeter.
This again carries an observation glass fitted with an eye-piece
which can be turned in the vertical plane in the same manner as
that of the fore-sight. By means of this ingenious sighting
device it is possible to ascertain the range and angle of fire
very easily and speedily.
The weight of the special Krupp anti-aircraft field-piece,
exclusive of the protecting shield, is approximately identical
with that of the ordinary light artillery field-piece.
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