seful for the purposes of navigation by day, but The engines, by contract, are to indicate 3,500 horse been 630/., and the cost of its annual maintenance was they were now equally so by night (in clear weather), power. Should this amount be exceeded on trial, the 887. Broadness light was produced… … sioners of North- an excess, as in ern Lighthouses the case of the at Ailsa Craig, on Vesuvius. The the Firth of Clyde (Min. Proc. Inst. C. E., vol. lxxxix., cept at considerable risk. page 297), the first cost of which had been 24,000/., while Vesuvius, but are only eight inches in diameter. the…
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