Report on Light-house Construction and Illumination |
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14 inch angle argand burner beam Bishop Rock bolts BURNING LEVEL candle unit candles cast-iron catadioptric catadioptric prisms catoptric central belt centre cistern coloured colza colza oil constant level lamp contractor copper cylindrical dioptric apparatus divergence Douglass burner engine feet fitted fixed apparatus fixed light flame flashing light focal plane focus fog signal gas buoys gas burner glass group-flashing gun cotton gun-metal height helical framing horizontal illuminating power inch diameter inch thick installed intensity iron James Douglass joints keepers lantern LENOX AND TILDEN lens LEVEL OF OIL light-house luminous millimetres mineral oil occulting light optical apparatus ordinary panels pedestal PHOTO-ZINCO pipe plate POHTO-PRINT SURVEY OFFICE pressure PUBLIC LIBRARY ASTOR rays reflectors revolving apparatus ring riveted screws service room shown siren SURVEY OFFICE MADRAS tested TILDEN FOUNDATIONS tower Trinity Buoy Wharf Trinity House valve ventilator vertical wick Wigham burner YORK PUBLIC LIBRARY