Report on Light-house Construction and Illumination
Superintendent, Government Press, 1895 - Lighthouses - 141 pages
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angle approved arranged attached beam buoy burner candles carried centre charge cistern clean closed complete consists copper cover cylindrical diameter dioptric directed distance divergence doors Douglass drawing electric engine equal feet fitted fixed flame flashes floor focal plane focus FOUNDATION four framing give glass height holes horizontal illuminating inches increased inside installed intensity internal iron joints lamp lantern LENOX less light light-house lower MADRAS means minutes necessary obtained occulting opened optical apparatus ordinary pattern pedestal pipe placed plate pressure prisms proper rays receivers revolving ring riveted rock round screws seconds secured service room shown sides signal siren sound square station steel supply surface SURVEY OFFICE taken tested tower Trinity House upper valve ventilation vertical walls whole wick Wigham YORK PUBLIC LIBRARY