. Lighthouse construction and illumination; . eastward of Point de Galle, and 6miles from the nearest land. The lighthouse was designedby Mr. James N. Douglass, and is placed on a hard red sand-stone rock, measuring 220 feet in length, 75 feet in breadth,and rising 6 feet above the mean sea level. The extremerange of the tide is about 3 feet, and the foundation of thetower is 2 feet above high water. The tower consists ofa cylindrical base 30 feet in height, 32 feet in diameter,surmounted by a tower 67 feet 5 inches in height, 23 feet indiameter at base, and 17 feet at the springing of the cav
. Lighthouse construction and illumination; . eastward of Point de Galle, and 6miles from the nearest land. The lighthouse was designedby Mr. James N. Douglass, and is placed on a hard red sand-stone rock, measuring 220 feet in length, 75 feet in breadth,and rising 6 feet above the mean sea level. The extremerange of the tide is about 3 feet, and the foundation of thetower is 2 feet above high water. The tower consists ofa cylindrical base 30 feet in height, 32 feet in diameter,surmounted by a tower 67 feet 5 inches in height, 23 feet indiameter at base, and 17 feet at the springing of the cavetto,the thickness of walls being 5 feet at the base and 2 feet atthe top. The cylindrical base is solid for 11^ feet. The towerand base contain 37,365 cubic feet of granite masonry, weigh-ing about 2768 tons. The work was begun on 6th March 1870, and the Hght w^as exhibited three years afterwards.^ ^ The Great Basses. By W. Douglass. Slin. Civ. Eng., vol. xxx^aii. LIGHTHOUSE TOWERS. 23 rig. 11 shows the Cordoiian Tower, in France, begun in. Fig. 11. the time of Louis XIV., which is given more as a specimen 24 LIGHTHOUSE CONSTRUCTION. of early liglitlioiise architecture than of a tower which ismuch exposed to the sea. There are several other lighthouses in situations moreor less exposed, such as the Horsburgh, near Singapore, de-signed and executed by Mr. J. T. Thomson; that on theAlguada Eeef, which, though somewhat higher, is, in otherrespects, a replica of the Skerryvore, and was successfullycarried out by Captain Fraser; the Prongs in India, byMr. Ormiston; the lights in the Eed Sea by Mr. Parkes;the South Eock and Haulbowline in Ireland; CraighiUChannel (Plate VII.) and Spectacle Eeef in America (PlateVIII.), which are exposed to the action of moving floes ofice. Those which have been described in detail are themost remarkable, and some of them will be referred to inillustration of the principles of construction, which wiU nowbe explained. General Principles which regulate
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