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Lighthouse optic from Eilean Glas lighthouse, 1907

IMAGE number
UIS5105658
Image title
Lighthouse optic from Eilean Glas lighthouse, 1907
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Location
Science Museum, London, UK
Medium
photography
Image description

Lighthouse optic from Eilean Glas lighthouse, 1907. Optic taken from the Eilean Glas Lighthouse, Scalpay Island, Scotland, on display in the Science Museum, 2007. The Eilean Glas optic is based on the dioptric or Fresnel principle, in which the light is focused and directed by concentric rings of prisms. This design allows the construction of lenses of great power and size that are not excessively thick. Nevertheless, in this optic, the glass elements alone weigh over 3 tons. They were made by Chance Brothers of Birmingham, the world leaders in this field at the time. The first light on the site was built in the 1780s to help mark the Minch - the channel between the Isle of Lewis and the Scottish mainland - and was updated in 1907 with the optic shown here. ©SSPL/Science Museum

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SSPL/UIG / Bridgeman Images
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