Page:Popular Science Monthly Volume 92.djvu/581

 Popular Science MonfJiIij

��probably is the most effective yet de- veloped. However, many other kinds have been patented. A Virginia man named Dunlop produced the one depicted on page 566. This is exploded through the driving in of a pair of \vings upon the bomb's striking the water. These wings release a suitable clockwork, which must run a short time before the primer is set off. Meanwhile the bomb is supposed to be sinking as a result of its initial velocity in striking the water. Whether or not it would always do this, and whether the complicated clock mechanism would a-1- ways run properly is open to doubt. But obviously a clockwork is one way of ex- ploding a depth-bomb and probably many working on the general principle are in current use. None of the Allied govern- ments will tell precise details of the latest

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developments in depth-bombs, for the Germans would be too interested. But from a consideration of general types already known in the depth-bomb field, an idea of the underlying and fundamen- tal principles may be obtained.

Airplanes Use Depth-Bomb

Not all depth-bombs are dropped by destroyers. Airplanes have used them with great success. On page 564 we show a type produced by W. J. Hallock of Jersey City. The explosive is contained within a long, pointed cylinder at the upper end of which is a detonator and a small electric battery. An insulated electric cable containing two wires is attached to the upper part of the cylinder, and leads to a relatively small parachute which serves to straighten out the cable

���How an airplane "gets" a submarine. A depth-bomb causes a tremendous explosion caving in a submarine anywhere in the vicinity. No wonder German submarine crews mutiny!

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