| 摘要 |
A firing circuit for a magnetic mine including an oscillator and magnetometer bridge is arranged to produce an alternating signal representative of the strength of the ambient magnetic field in the neighborhood of the mine. This signal after rectification and filtering is differentiated to produce a comparatively small direct current signal representative of the rate of change of the surrounding magnetic field. After amplification the signal is in turn applied to a pair of parallel gas tube channels designed to be fired in response to increases and decreases respectively of the signal, and the outputs of the two gas tube channels are retained and combined. A final output circuit is adapted to be fired in response to a predetermined output of the combining network. Since a unidirectional change in field strength will fire only one of the two parallel gas tube channels the circuit becomes responsive to signals of reversed characteristic only, such as may be occasioned by the passage of a ship through the magnetic field of the mine.
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