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Spider Bridge at Falls of Schuylkill
Spider Bridge at Falls of Schuylkill was an iron-wire footbridge erected in 1816 over the Schuylkill River, north of Philadelphia, Pennsylvania. Though a modest and temporary structure, it is thought to have been the first wire-cable suspension bridge in world history.
==Chain bridge==
The Chain Bridge at Falls of Schuylkill, an iron-chain suspension bridge designed by James Finley, was built at Falls of Schuylkill in 1808.〔Falls of Schuylkill was outside the city limits until 1854, when Philadelphia County merged into the City of Philadelphia.〕 It was among the earliest suspension bridges erected in the United States. To supply materials for its construction, ironmakers Josiah White and Erskine Hazard built a rolling mill along the river near its eastern abutment.〔Jackson, pp. 411–12.〕
Although Finley patented his Falls of Schuylkill bridge and publicized it widely, it was not a success: "''Part of the superstructure broke down in September, 1810, while a drove of cattle was crossing it, and in January, 1816, the bridge fell down, occasioned by the great weight of snow which remained on it, and a decayed piece of timber.''"〔Jackson, p. 412.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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