Qualla: Pendeen Lighthouse

Pendeen Lighthouse: Introduction

Sat, 23 May 2026 00:00:00 GMT

Photo credit Herbythyme, CC BY-SA 4.0. Forty litres of liquid mercury. That was what kept the great fresnel lens at Pendeen Lighthouse rotating, silently and almost frictionlessly, for over a century. The lens floated on its mercury bath like an immense crystal raft, turning once every fifteen seconds in answer to a clockwork drive that the keepers used to wind by hand. In 2025, Trinity House removed the mercury and the lens together as part of a modernisation programme; a self-contained LED lantern took their place. The change is invisible from below: the same white flash still sweeps the Atlantic every fifteen seconds, the same warning held over the same drowning rocks. Inside, an industrial era has ended.

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Image: Herbythyme | CC BY-SA 4.0

Pendeen Lighthouse: First Light, 1900

Sat, 23 May 2026 00:00:00 GMT

Photo credit Tom Corser, CC BY-SA 3.0. The lighthouse stands on the cliff two kilometres north of the village of Pendeen, on a headland called Pendeen Watch. It is within the Aire Point to Carrick Du Site of Special Scientific Interest, the Cornwall Area of Outstanding Natural Beauty, and the Penwith Heritage Coast. T...

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Image: Tom Corser | CC BY-SA 3.0

Pendeen Lighthouse: Three Keepers, Four Cottages

Sat, 23 May 2026 00:00:00 GMT

Photo credit chris lovelock, CC BY 2.0. Attached to the tower is a low E-shaped block split into four cottages. Three housed the resident keepers, their wives, and their children; the fourth was the duty office and the supernumerary keeper's bunk. Water came off the flat roof of the accommodation block, drained into an...

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Image: chris lovelock | CC BY 2.0

Pendeen Lighthouse: Light, Wick, Mantle, Bulb

Sat, 23 May 2026 00:00:00 GMT

Photo credit Row17, CC BY-SA 2.0. The first lamp was a five-wick Argand burner, made by Chance Brothers of Smethwick near Birmingham - the great Victorian glass and lighthouse engineering firm that supplied half the world's lenses. In 1906 it gave way to a vapour burner with a range of 20 nautical miles. In 1922 ...

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Image: Row17 | CC BY-SA 2.0

Pendeen Lighthouse: The Last Keeper Leaves

Sat, 23 May 2026 00:00:00 GMT

Photo credit Nilfanion, CC BY-SA 4.0. On 3 May 1995, the keepers walked out of Pendeen Watch for the final time and the station was automated. The clockwork that had turned the great lens was already gone - replaced by electric motors in 1963 - and now everything else followed. The 3.5-kilowatt filament lamps gave wa...

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Image: Nilfanion | CC BY-SA 4.0

Pendeen Lighthouse: Mercury Out, LED In

Sat, 23 May 2026 00:00:00 GMT

Photo credit Row17, CC BY-SA 2.0. In 2025, after 119 years of doing the same job, the revolving fresnel lens assembly was lifted out of Pendeen tower during Trinity House modernisation works. Trinity House had been removing mercury from its lighthouses across England for years - the metal vapour was now classed a...

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Image: Row17 | CC BY-SA 2.0