| 词条 | Oldtown Covered Bridge |
| 释义 |
| name = Oldtown Covered Bridge | nrhp_type = | image = OLDTOWN COVERED BRIDGE.jpg | caption = | nearest_city= Oldtown, Kentucky | coordinates = {{coord|38|25|53|N|82|53|42|W|source:NRIS2013a|name=Oldtown Covered Bridge|display=inline,title}} | locmapin = Kentucky | added = March 26, 1976 | area = {{convert|2|acre|ha}} | refnum = 76000893[1] }}Oldtown Covered Bridge, near Oldtown, Kentucky, was listed on the National Register of Historic Places in 1976.[1] It is located east of Kentucky Route 1, south of Oldtown. It brings Frazer Branch Road 750 over the Little Sandy River. It is a two-span Burr truss bridge.[2] 'Oldtown is NOT a Burr truss. The definition of it and several other bridges as a "Burr truss" was proposed by Vernon White in a paper he wrote titled "A Treatise on the Burr Family of Trusses." Vernon had determined that the "multiple kingpost" truss was an unarched variation of the Burr and this information has been used frequently to describe these trusses in Kentucky. Vernon was a sociologist and had no formal training in structure. His treatise is generally accepted as flawed and not well researched. The specific improvement that Burr advanced in bridge design was to place the roadway BETWEEN the arches as opposed over them. As the triangle is the most sturdy structure in engineering, use of the simple multiple kingpost was sensible in stiffening the arch. Robert W. M. Laughlin References1. ^1 {{NRISref|version=2013a}} {{National Register of Historic Places}}{{Kentucky-NRHP-stub}}2. ^{{cite web|url={{NRHP url|id=76000893}}|title=National Register of Historic Places Inventory/Nomination: Oldtown Covered Bridge |publisher=National Park Service|author=John Johnson |date=June 9, 1975 |accessdate=September 8, 2018}} With {{NRHP url|id=76000893|photos=y|title=accompanying map and photo from 1976}} 2 : Covered bridges in Kentucky|National Register of Historic Places in Greenup County, Kentucky |
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