File:Condensing light. Lighthouse optic, designed by Thomas Stevenson. Chance Brothers and Company, Birmingham, 1866. National Museum of Scotland, Edinburgh.jpg

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English: Condensing light. Lighthouse optic, designed by Thomas Stevenson, was exhibited in Paris, France, in 1867. It demonstrated his design for the Tay Leading Light, one of two lights that guided shipping into the River Tay. Chance Brothers and Company, Birmingham, 1866. National Museum of Scotland, Edinburgh, Scotland, UK.
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Author Osama Shukir Muhammed Amin FRCP(Glasg)

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11 November 2015

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