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Souter Lighthouse is a lighthouse located in the village of Marsden in South Tyneside, Tyne and Wear, England. Souter was the first lighthouse in the world to be actually designed and built specifically to use alternating electric current, the most advanced lighthouse technology of its day.

Souter foghorn has seen many changes over the years. When the lighthouse was first built, a single horn of a clay and iron pipe design, facing straight out to sea, was provided. This was replaced in 1873 by a pair of twin horns to the same design, angled to spread the noise up and down the coast. In turn these were superseded by twin Rayleigh trumpets in the 1920s, with the foghorn house remodelled at the seaward corners to accommodate them, then in 1953 these gave way to the present diaphone fog horns.
The horns produced a five-second blast every 30 seconds in poor weather up until 1988, when Souter Lighthouse was decommissioned by Trinity House. The siren signal was a 5-second sound of 480 Hz every 5 minutes.
The foghorns remain in working order and are sounded on special occasions throughout the year, most notably during the monthly Engine Room Day, which is held at the lighthouse during the summer months.

Source : Souter Lighthouse from Wikipedia (licence CC-by-sa)

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