Mercury Bath

From International Dictionary of Marine Aids to Navigation
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Alternative ter: Mercury Trough

An annular trough containing mercury on which the optic of a revolving light floats, usually under the guidance of rollers.

Ch2 Fig10.jpg

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