Magnetic mine by G. H. Davis

The German magnetic mine: the first diagrams of its working and the methods by which it is laid. Diagrams showing the delicate electrical mechanism which reacts to the weak magnetic field set up by a metal-hulled ship, and the parachute device for dropping the mine

Delicate Diagrams Dropping Horace Hulled Laid Magnetic Mechanism Methods Mines Parachute Reacts Spread Weak

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