Frame (of an optic)

From International Dictionary of Marine Aids to Navigation
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Alternative term: Framework (of an optic)

A rigid structure, usually of metal, in which the refracting and reflecting elements of an optic are mounted. (Figs. 10 and 16b)

Ch2 Fig10.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