Antique book illustration: lighthouse lens - Illustration

19th Century, Antique, Black And White, Cut Out, Illustration

Antique book illustration: lighthouse lens royalty-free stock vector art
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Antique book illustration: lighthouse lens royalty-free stock vector art

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Stock illustration ID:172423749
Upload date:June 30, 2013

Description

'Antique woodcut, showing a schematic view of a lighthouse lens mounted on a stand. This type of lens design, aka echelon or fresnel lens, reduces considerably the volume of glass needed for large lenses with short focus distance. Used in a lighthouse, the rays of light would be paralell after passing through the lens, greatly increasing the visible distance. Illustration from a book in Physics from 1883.Vintage lighthouses:'
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