Île Vierge Apparatus.

Twin Apparatus.


A method of doubling the power of a light is by mounting two complete and distinct optics side by side on the same revolving table, as shown of the Île Vierge apparatus. Several such lights have been installed by the French Lighthouse Service.


 


 


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Source: Encyclopaedia Britannica 11th Edition,
Volume 16, Slice 6 "Lightfoot, Joseph" to "Liquidation"
Published in 1910-11 Available from www.gutenberg.org


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