Copper magtails coated with black rubber are shown on the left with canvas
 covered flotation devices on the right. Towed behind the minesweeper,
electrical current is pulsed through the magtails to simulate the magnetic pull
of a vessel. The magnetic mine would then explode.

The main electrical copper cable sealed with black rubber

Magtail attached to the main electrical cable

Dummy practice mines used for training,
Subic Bay Naval Station, Republic of the Philippines August 1968

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