These were connected at a higher level to the sounding tanks, which fed the compressed air to the diaphone itself, mounted behind its trumpet-like emitter which protruded through the window. Compressed air was provided to six cylindrical storage tanks by a pair of Reavell compressors, all located (together with a standby generator) within the base of the tower. In 1940 the lighthouse was provided with an F-type diaphone fog signal, sounding from a window part-way up the tower. Interior view of the lamp and lenses in 2017. The light was electrified in the mid-1950s. A red sector light was provided in addition to the main light, shining from a window in the lower part of the tower, to indicate the position of The Shambles. The lighthouse was completed in 1905 at a cost of £13,000, and the lamp first lit on 11 January 1906. A pressurised vapour paraffin lamp was used, placed at the centre of a large ( first-order) revolving optic weighing 3.5 tons, this was made up of four asymmetrical catadioptric lens panels and a concave prismatic reflector. Chance & Co of Birmingham supplied and fitted the lantern. of Plymouth, began work on the foundations in October 1903. At the turn of the 20th-century, Trinity House put forward plans for building a new lighthouse at Bill Point. They were constructed in 1716, both rebuilt in 1869, and decommissioned following the completion of the present lighthouse. The two original lighthouses, now known as the Old Higher Lighthouse and Old Lower Lighthouse, operated as a pair of leading lights to guide ships between Portland Race and The Shambles sandbank. History Portland Bill Lighthouse at dawn with Trinity House Landmark in the distance The lighthouse guides passing vessels through the hazardous waters surrounding the Bill, while also acting as a waymark for ships navigating the English Channel. It was completed by 1906 and first shone out on 11 January 1906. Īs Portland Bill's largest and most recent lighthouse, the Trinity House operated Portland Bill Lighthouse is distinctively white and red striped, standing at a height of 41 metres (135 ft). The lighthouse and its boundary walls are Grade II Listed. Portland Bill Lighthouse is a functioning lighthouse at Portland Bill, on the Isle of Portland, Dorset, England. White tower with a red horizontal band, white lanternġst order catadioptric rotating (original), LED lantern (current) Tapered cylindrical tower with balcony and lantern
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