Fresnel Profile

From International Dictionary of Marine Aids to Navigation
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Fresnel Profile (of a lens or fixed lens)

A stepped profile of both dioptric and catadioptric elements, the dioptric part of which presents one straight side towards the focus.

(Figs. 10, 14 and 16)

Ch2 Fig10.jpg

Ch2 Fig14.jpg

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