. Lighthouse construction and illumination; . Fig. 82. FIXED CONDENSING LIGHTS. 109 is sliown in vertical and horizontal sections (Figs. 83, 84), andin front elevation (Plate XX.) The main apparatus is a half-circle of a fixed light instrument, ale (Fig. 83), and h h h.

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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondo, bookyear1881