Lantern handhold

From International Dictionary of Marine Aids to Navigation
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U or D shaped handhold made from metal rod, fixed to an astragal to provide additional security for personnel when using a ladder outside the lantern.

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

diameter at the waterline (m)

change in the value of a term

Solar declination angle (in degrees)

Forward amplitude

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