Report on Light-house Construction and Illumination |
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ABTOR angle Apparatus.-The optical apparatus Bishop Rock bolts brass candle unit candles cast-iron catadioptric catoptric cement centre cistern clean colza oil compressed contractor copper cylinder dioptric apparatus doors Douglass burner engine feet above high-water fitted fixed apparatus fixed light flame flashes floor focal plane fog signal gallons GAS BUOY glass glazing group-flashing gun cotton gun-metal height helical framing high-water level holes horizontal inch inch thick inches diameter inches wide installed intensity iron James Douglass joints keepers lantern pedestal LENOX AND TILDEN Light-house man-hole millimetres mineral oil occulting occulting light Optical Apparatus.-The optical ordinary PHOTO-ZINCO pipe plate pressure prisms PUBLIC LIBRARY ASTOR pump rays reflectors ring rivets screws secured service room siren slate sound square inch steel SURVEY OFFICE MADRAS tanks tested TILDEN FOUNDATIONS tower Trinity Buoy Wharf Trinity House valve ventilation vertical walls wick wrought wrought-iron YORK PUBLIC LIBRARY