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What replaced coal fires in lighthouses?

 title: 'A coin with a lighthouse depicted on it.'

Eighteen sperm-oil lamps took the place of the flickering coal fire at Dungeness[1]. At the North Foreland, a lantern lit with oil lamps supplanted the coal fire all together[1]. The owners went back to their coal fire again, and kept it up so badly that bitter complaints arose from those who worked the Channel trade[1].

Space: Lighthouses Their History And Romance

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