Drum Lens

From International Dictionary of Marine Aids to Navigation
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2-2-100


(Dioptric) Drum Lens

A fixed lens consisting of dioptric elements only. (Fig. 16b)

Ch2 Fig16b.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