Difference between revisions of "Drum Lens"
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Latest revision as of 11:01, 1 March 2009
(Dioptric) Drum Lens
A fixed lens consisting of dioptric elements only. (Fig. 16b)
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