. Lighthouse construction and illumination; . views, consultedMr. Telford; and before going to Parliament for the secondtime they also, on Mr. Stevensons suggestion, obtained thesupport of Mr. Eennie to the scheme, with whom Mr. Steven-son could afterwards advise in case of emergency during theprogress of the work. The second bill was passed in 1806,and the works were begun in 1807. In 1808 the excavationwas finished, and the masonry brought up to the level of therock. In 1809 the work was carried up to 17 feet abovehigh water. In 1810 the whole tower was finished, andthe light was exhibited i
. Lighthouse construction and illumination; . views, consultedMr. Telford; and before going to Parliament for the secondtime they also, on Mr. Stevensons suggestion, obtained thesupport of Mr. Eennie to the scheme, with whom Mr. Steven-son could afterwards advise in case of emergency during theprogress of the work. The second bill was passed in 1806,and the works were begun in 1807. In 1808 the excavationwas finished, and the masonry brought up to the level of therock. In 1809 the work was carried up to 17 feet abovehigh water. In 1810 the whole tower was finished, andthe light was exhibited in 1811. The total weight of thetower is 2076 tons.^ STcerryvore Lighthouse.—The Skerryvore rocks in ArygU-shire lie 12 miles off the island of Tyree, which is the nearest ^ Account of tlie Bell Rock Lighthouse, by R. Stevenson. Edin. 1824. C 18 LIGHTHOUSE CONSTKUCTION. land. The main rock is of considerable extent, and beinggneiss, is of great hardness. The works, which were designedand carried out by the late Mr. Alan Stevenson, were com-. igMN^t^^e^>x^?^-^<-^^$N^^^s.^; 20 30 40 50 60 70 /• ^ Fig. 10. menced in 1838 by the erection of the framework of a bar-rack similar to that used at the Bell Eock, but it was carriedaway in November of the same year, after which another was LIGHTHOUSE TOWERS. 19 erected in a more sheltered position. The works were notfinished until 1843. The tower (Fig. 10), which is of granite,is 138 feet high, 42 feet diameter at the base and 16 feet atthe top. It contains a mass of stonework of 58,580 cubic feet,or more than double that of the Bell Eock, and not muchless than five times that of the Eddystone. The curveadopted for the shaft of the tower was the hyperbolic.^ Fastnet Rock.—The Fastnet lies about 4J miles to thewestward of Cape Clear, and is a light of great importanceto all oversea vessels making the south coast of Ireland astheir landfall. The rock, which is surrounded by deep waterin almost every direction, attains a maximum he
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