the machinery, propellers or car, when
it will cause sufficient damage to throw the craft out of action.

The elaborate trials which were carried out with the obus fumigene
certainly were spectacular so as they went. Two small spherical
balloons, 10 feet in diameter, and attached to 1,000 feet of cable, were
sent aloft. The anti-aircraft guns themselves were placed about 5,100
feet distant. Owing to the inclement weather the balloons were unable
to attain a height of more than 200 feet in a direct vertical line above
the ground. The guns were trained and fired, but the one balloon was
not hit until the second round, while the third escaped injury until the
fifth round. When struck they collapsed instantly. Though the test was
not particularly conclusive, and afforded no reliable data, one point
was ascertained--the trail of smoke emitted by the shell enabled its
trajectory to be followed with ease. Upon the conclusion of these
trials, which were the most successful recorded, quick-firing tests
in the horizontal plane were carried out. The best performance in this
instance was the discharge of five rounds in eight seconds. In this
instance the paths of the projectiles were simple and easy to follow,
the flight of the shell being observed until it fell some 18,670 feet
away. But the Krupp firm have found that trials upon the testing ground
with a captive balloon differ very materially from stern tests in the
field of actual warfare. Practically nothing has been heard of the two
projectiles during this war, as they have proved an absolute failure.

Some months ago the world was startled by the announcement that the
leading German armament firm had acquired the whole of the interest in
an aerial torpedo which had been evolved by the Swedish artillerist,
Gustave Unge, and it was predicted that in the next war widespread havoc
would be wrought therewith. Remarkable claims were advanced for this
projectile, the foremost being that it would travel for a considerable
distance through the air and alight upon the objective with infallible
accuracy. The torpedo in question was subjected to exacting tests in
Great Britain, which failed to substantiate all the claims which were
advanced, and it is significant to observe that little has been heard
of it during the present conflict. It is urged in certain technical
quarters, however, that the aerial torpedo will prove to be the most
successful projectile that can be used against aircra