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Ada Covered Bridge : ウィキペディア英語版 | Ada Covered Bridge
The Ada Covered Bridge is a span Brown truss covered bridge erected in 1867 in Ada, Michigan, United States. Carrying Bronson Street across the Thornapple River, it is located just south of where the Thornapple enters the Grand River, in turn just south of M-21. It is listed on the National Register of Historic Places. == Design ==
The bridge uses the Brown truss system, consisting of diagonal compression beams and almost vertical tension members (slanting in at the top toward the center of the span) was patented by Josiah Brown of Buffalo, New York in 1857. A timber bearing Brown's name was discovered during repair work carried out in 1913.〔Historical marker data, from (marker detail ) page on michigan.org site, accessed October 09, 2006〕 The bridge is long, and originally rested on wooden pilings. As is typical for covered bridges, its gabled roof is covered with creosote shingles.
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「Ada Covered Bridge」の詳細全文を読む
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