One of the most important changes in Lighthouse apparatus was, unquestionably, the introduction of Revolving Lights at the Tour de Corduan about the year 1780.
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The characteristics of the two systems of illumination by Reflection and Refraction may be briefly described as follows
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Those two systems of illumination possess advantages and defects peculiar to each.
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The introduction of lenticular apparatus into Lighthouses has been the last great improvement effected intheir illumination
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The introduction ofRevolving Lights attheTour deCorduan about theyear 1780…greatly extended themeans ofdistinguishing onelight from another
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