Engraved plate illustrates an echelon lens, often used in lighthouses. Constructed in several layers, the central lens is extended in a series of annular rings. The thick glass absorbs less heat and light than lenses of the same diameter made of a single piece of glass. More information can be found on page 82.
This illustration comes from The Phenomena and Laws of Heat by Achille Cazin. Frontismatter and select illustrations have been digitized from this work on the laws of heat.
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Cazin, Achille. “Components of an Echelon Lens.” The Phenomena and Laws of Heat. New York, New York: Scribner & Co., 1869. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/o8dhoww.
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