French lighthouses
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C.
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Article
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1880
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Elsevier Science
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English
โ 60 KB
## 417 ltrench Lighthouses.--All the lighthouses on the French coast, .except three which are provided with the electric light, have been lit since 1873 with lamps burning mineral oil. The luminous intensity ,of the apparatus has been greatly increased, and notwithstanding the increase a saving has