This engraving is from the 1898 German encyclopaedia Brockhaus Konversations-Lexikon depicts two famous lighthouses. On the left, the one of Eddystone in Cornwall (fig. 1), the 4th built in 1877 by the british engineer sir James Douglass (next to wich you can see the stub of the former tower, that has been dismantled in 1877 and rebuilt in Plymouth as a memorial). On the right, the lighthouse of Świnoujście in Poland (German: Swinemünde) built between 1854 and 1857, facing the Baltic Sea (fig. 2). The table contains also section cut drawings of three types of lantern, described as “flashing” (fig. 3), “fixed” (fig. 4) and provided with “catadioptric apparatus” (katadioptrischem Apparat), that is a Fresnel lens system (fig. 5).

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