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MEANS OF DEFENSE AGAINST SUBMARINE ATTACK 149
ditions upon the projectile, a bomb could be dropped so
as to strike the water directly over a submarine, the force
of its impact with the water must explode the bomb
Photo-copyright, International Film Service
Submarine gun elevated for repelling attack by Aero-plane
practically upon the surface and do no damage whatever
to the submarine. The probability of dropping a bomb
with such accuracy is, moreover, very remote. Nor can
much better results be expected from gunfire from the
air. Unless the projectile was fired almost vertically
downward, the force of the impact with the water would
cause it to ricochet before it had penetrated the surface a
foot. Even were the submarine upon the surface, the