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Keskiniemi beacon tower (''Keskiniemen tunnusmajakka'' in Finnish), also often referred as Karvo beacon tower, is a historic daymark located on a promontory of Keskiniemi in northwestern part of Hailuoto island in the Gulf of Bothnia in Finland. The tower was built in 1858 to alert the vessels about sandbars reaching northwest from the site. It is the oldest surviving navigational aid on Hailuoto island.〔(Eino Merilä: Koirantakkua ja karupäitä: Luonnon monimuotoisuuden yleissuunnitelma Hailuodon maatalousympäristölle ) (in Finnish), page 13〕 The tower has structural similarities with Härkmeri beacon tower built in 1857.〔(Merenkulkulaitos: Virtuaalinen veneretki: Härkmeri ) (in Finnish)〕 The wooden tower has a six-metre (20 ft) high square base with square pyramidical top. The first floor houses a 70 cm ( feet) thick layer of stones serving as counterweight to prevent the structure from tipping in wind. The structure also has wooden beams in all four corners for increased support against winds. The tower has a wooden top ornament.〔Seppo Laurell: Suomen majakat (Finnish Lighthouses), 1999, page 69, ISBN 952-5180-21-2〕 The structure measures 18,9 meters (62 ft) high from the ground, with the top being 20,9 meters (87 ft) above sea level. All faces are white.〔 The current beacon tower is the second navigational aid located on the Keskiniemi promontyory. In a navigational map dated on 1785 by Henrik Wacklin a beacon tower is shown at the same location.〔 The tower has never been lit. A modern Keskiniemi sector light has been erected alongside the tower. ==References== 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「Keskiniemi beacon tower」の詳細全文を読む スポンサード リンク
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