. Lighthouse construction and illumination; . ^ ^^ > ^ ^ PLATE xxnr ELEVATION OF THE FIRST DIOPTRIC HOLOPHOTAL REVOLVING LIGHT (ISTORDER)DESIGNED OCTOBER 1850, FOR NORTH RONALDSHAY ,AND CONTRACTED FOR BY M . LETOURN EAU, ON S J ANY, 1851 .

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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondo, bookyear1881