of Stoneness Lighthouse had only useful for the purposes of navigation by day, but The engines, by contract, are to indicate 3,500 horse been 6302., 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… … sioners of North- an excess, as in THE ENGINES OF THE VESUVIUS AND YORKTOWN. ern Lighthouses the case of the at Ailsa Craig, on Vesuvius. The the Firth of Clyde (Min. Proc. Inst. C. E., vol. lxxxix., nels, which hitherto could not have been attempted ex- shafts are of the same style and material as…
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