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Still, however, the light being exposed in an open chauffer, was little to be depended on at any great distance from the shore, so that about the year 1780 reflectors and lamps were introduced, and in 1822 the light received its last improvement by the introduction of Fresnel’s beautiful apparatus.
The Dutch were the first to adopt Fresnel’s system. In the year 1834 the Commissioners of Northern Lighthouses sent Mr. Alan Stevenson to Paris to inspect the system, and his report was so favourable, that the reflecting apparatus of the revolving light at Inchkeith was removed, and the dioptric instruments substituted.
His idea was, that by giving a certain velocity of revolution to a series of lenses round a fixed light, as in Fresnel’s arrangement, a continuity of illuminative power, equal almost in brilliancy to that of a slowly revolving light, might be produced.
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