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mineral oil with rotating apparatus floating on mercury. This method for rotating lights by floating the apparatus on a bath of mercury, which eliminated friction and permitted revolutions as frequent as every 15 seconds, was invented in 1890. The technique led to a system of identifying lighthouses by the pattern of intervals of light and darkness. Waglan Light was one of only two such modern pieces of equipment introduced and installed in Asian waters at that time. The other one was installed on the Lao-t'ich-shan Light at Dairen. The British, after taking Waglan over, installed a diaphone fog signal. During its eight-year history as a Chinese light, no fewer than 222 fog-signal guns were fired during the month of April 1894. The fury of the sea at this spot during typhoons is notorious. In 1896, waves flooded the fresh water tanks and completely carried away the derrick used for landing stores, while the spray reached the lantern, 225 feet above high water, pitting the panes with sand and gravel.
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The cast iron tower is 52 feet high in the shape of a cone. It is painted white with a red upper portion. During the Second World War Waglan Lighthouse was extensively damaged by bombing. Repairs took place after 1945. It has been unmanned since August 1989. Waglan Lighthouse acts not only as a navigation aid but also as an outpost where weather information on the eastern corner of the territory is collected and fed to the Hong Kong Observatory,
Tang Lung Chau Lighthouse
Situated on Tang Lung Chau, a small island to the west of Hong Kong Island, Tang Lung Chau Lighthouse is also commonly known as Kap Sing Lighthouse. It was put into service on 29th April 1912. It has a skeletal steel tower, 11.8 metres high, with a white lantern on top. The steel tower and light apparatus were obtained from England. Skeleton structures are normally used for supporting lights on soft or insecure bottoms - such as on sandbanks, coral reefs and shoals. The brick building which was the light keeper's house has a bedroom, a kitchen, a latrine and a storeroom. Rainwater was collected from the roof and diverted into an underground tank as there was no spring or fresh water supply on the island. The lighthouse is now unmanned and automated. Together with Waglan, this lighthouse was declared a historical structure on 29th December 2000.