File:Collections of the National Maritime Museum, London 2010 PD 03.JPG

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English: Collections of the National Maritime Museum, London
English: optic from the Tarbat Ness lighthouse: designed and installed in the lighthouse by David Stevenson, 1892: The Tarbat Ness lighthouse was built in 1830 on the site of an ancient Roman fort at the mount of the Moray Firth in north-east Scotland. It overlooks a wild and windy coast that, in local folklore, was danced on and flown over by witches. – Robert Sevenson designed the lighthouse at Tarbat Ness. His grandson, David (cousin of author Robert Louis Stevenson), produced the innovative design for the optic, which was installed in 1892. It was in use until the automation of the lighthouse in 1985. Tarbat Ness became the first costal lighthouse to have flashing lights which could be seen asfar as 24 miles (38.6 km) out to sea. – Lighthouses were originally lit by naked flames. This was very hazardous and they ofteh burnt down. Oil and gas lamps were safer but replaced soon after electric light was introduced in 1862.
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