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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Johnson Creek Covered Bridge ： ウィキペディア英語版 Johnson Creek Covered Bridge The Johnson Creek Covered Bridge is located four miles north of Blue Licks Battlefield State Park in Robertson County and open to vehicular traffic with a weight limit of six tons. The bridge is important as the only known example of Robert Smith's truss system in Kentucky and the only covered bridge extant known to have been built by Jacob N. Bower (1819-1906). The bridge was constructed in 1874 and is one of 13 that remain of more than 400 covered bridges in Kentucky. Around 1912, Jacob Bower's son, Louis, added an arch on each side to support increased traffic using the bridge. The bridge is 114 feet long and 16 feet wide, according to Louis Bower, grandson of Jacob Bower and a local covered bridge builder.〔 Later generations have advanced numerous reasons for the construction of covered bridges, but the historical reason for their existence was the maintenance of structural integrity. The cover allowed timbered trusses and braces to season properly and kept water out of the joints, prolonging their lives by seven to eight times that of an uncovered bridge.〔 ==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「Johnson Creek Covered Bridge」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.