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198
THE SUBMARINE TORPEDO BOAT
lever is brought into contact with the bottom of the ship.
All floating mines are of the simple contact type.
Simple contact mine
For harbor defense work this simplest form of contact
mine is however as dangerous to friend as to foe, and
therefore electrically fired detonators in many different
forms are almost universally used at the present time.
The electro-contact mine is constructed on the same
general principles as the simple contact mine, except that
the firing pin when driven in by a passing ship, instead of