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Double Island Point Light is an active lighthouse located at the summit of Double Island Point, a coastal headland within the Cooloola section of the Great Sandy National Park. It is located at the southern end of Wide Bay, north of Noosa Heads, Queensland, Australia. Though the location was indicated for a lighthouse in 1864, it was only constructed in 1884, by W. P. Clark, who constructed other Queensland lighthouses. Upgrades to the kerosene fueled light and the lens occurred in 1923 and 1925. A major reconstruction occurred in 1933 when the light was converted to 110 V electricity, significantly increasing its luminosity, and new cottages replaced the originals. In 1980 the light was converted to 240 V and finally, solar conversion took place in 1991. Double Island Point Light became automatic the following year. The lighthouse is typical for Queensland, made of timber frame clad with galvanized iron plates, painted white with a red dome. It is surmounted by an original Chance Brothers lantern with a modern VRB-25 self-contained rotating beacon mounted inside. It is surrounded by several auxiliary structures. The two lighthouse keepers' cottages, hardwood framed and sheeted with asbestos cement, are at a lower level, with a few other buildings. The site is positioned in the Great Sandy National Park, but there is no public access to the lighthouse. ==History== The colony of Queensland was formed in 1859. In 1862, the Queensland government appointed the first Portmaster, Commander George Poynter Heath. However, it was only in 1864 that two committees were appointed to deal with the issue of coastal lighthouses. One of the locations indicated by these committees as a possible suitable site was Double Island Point. However, it was to take almost two decades until the Queensland Government took action upon this recommendation. In 1881 or 1882 Heath made a report to the Parliament stating the need for the lighthouse. In 1883 he made a visit to the island and realised that the original planned location, halfway up the point, would result in a light that would not be visible to the north. He advised that the lighthouse will be constructed at the summit of the point, with a 3rd Order light, a more powerful light than originally planned, and advise which was accepted. Plans were made by the Queensland Colonial Architect's Office, and at the end of June 1883 tenders were called, for the construction of the lighthouse and lighthouse keeper cottages, for both Double Island Point Light and c. The contract for both lightstations, for the cost of £6900, was awarded to W. P. Clark, who already constructed Queensland's first lighthouse since Queensland's formation, Bustard Head Light (in 1868), and who was also awarded the contract for Low Isles Light in 1877 and for Cape Cleveland Light and Dent Island Light in 1878. The lighthouse was first exhibited on 11 September 1884, the eighteenth to be constructed by the Queensland Government. The original lamp was an oil wick burner with an intensity of 13,000 cd. It was fixed, with revolving panels. Three lighthouse keeper cottages were also constructed, originally located near the lighthouse. A schoolhouse was also established at the point at the same time, which was active until 1922. In 1923, the light was converted to a incandescent gas mantle fueled by vapourised kerosene, with an intensity of 100,000 cd. A further upgrade in 1925 replaced the lens with a third order focal length revolving apparatus floating in a mercury bath. In 1933 the light was converted to 110V electricity, the lamp having an intensity of 750,000 cd. The original cottages were demolished and two modern cottages were constructed, further down the hill than the original ones, at the old location of the schoolhouse, at the crest of the ridge. A new watch hut was also constructed at that time.〔 says the previous hut was standing at 1932 and the new one was in place in 1940 and deduces that the new hut was probably constructed in 1933 with the cottages.〕 In 1961 the radio was moved from the lighthouse area to a radio hut which was constructed near the cottages. This radio hut now serves as a weather hut. In 1980 a new power house was constructed, holding two diesel engines, and bulk fuel tanks were installed. At that time the light was converted to 240V AC and the light source was a 120V 1000W tungsten halogen lamp with an intensity of 1,000,000 cd, visible for . The light was finally converted to a solar powered VRB-25 on 9 October 1991,〔. Note that says this happened in 1992, but might be referring to the actual demanning.〕 at which point the third order optic apparatus and the lamp were removed. This reduced the strength of the light considerably, to 48,430 cd, resulting in a reduction of the range of visibility to . The station was fully automated, and staff removed, in 1992. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Double Island Point Light」の詳細全文を読む スポンサード リンク
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