Electromagnetic horn

From International Dictionary of Marine Aids to Navigation
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3-2-220

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)

centre of gravity

Centre of buoyancy

South

ampere

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM