Name: An engraving depicting a Fresnel echelon or lighthouse lens from the front and side. At A is a plano-convex lens a foot in diameter surrounded by glass rings whose curvature is calculated so that they have the same focus as A. M, N are mirrors which turn light which escapes the lens into the same path as the primary beam. Dated 19th century - SuperStock
Brand: Image Asset Management
SKU: 1746-29960672
Availability: InStock

An engraving depicting a Fresnel echelon or lighthouse lens from the front and side. At A is a plano-convex lens a foot in diameter surrounded by glass rings whose curvature is calculated so that they have the same focus as A. M, N are mirrors which turn light which escapes the lens into the same path as the primary beam. Dated 19th century

SuperStock offers millions of photos, videos, and stock assets to creatives around the world. This image of An engraving depicting a Fresnel echelon or lighthouse lens from the front and side. At A is a plano-convex lens a foot in diameter surrounded by glass rings whose curvature is calculated so that they have the same focus as A. M, N are mirrors which turn light which escapes the lens into the same path as the primary beam. Dated 19th century by World History Archive/Image Asset Management is available for licensing today.