Electromagnetic horn

From International Dictionary of Marine Aids to Navigation

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urn:mrn:iala:dic:3-2-0220

Alternative terms: Electromagnetic horn (G.B.), (Electromagnetic air) Oscillator (U.S.A.)

A fog signal apparatus comprising a resonant diaphragm maintained in vibrating motion by electromagnetic action.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

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