Diaphone - Piston

From International Dictionary of Marine Aids to Navigation
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Piston (of a diaphone)

That part of the diaphone in reciprocating motion and comprising both the moving part of the driver and the modulator.

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

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