Belt (of a fixed lens)

From International Dictionary of Marine Aids to Navigation
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The optically central portion of a fixed lens, consisting of a refracting element of annular shape and lenticular cross-section.

Ch2 Fig16a.jpg

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