Dennis J. De Witt (Author)
Boston's largely intact 1846–48 Cochituate aqueduct, designed by two pioneering engineers, John B. Jervis and Ellis Chesbrough, was the second municipal aqueduct in the United States. Its two principal gatehouses incorporate different wrought-iron roof truss systems which are the oldest extant in the U.S. Its Brookline gatehouse also has the oldest wrought-iron plate roof and oldest extant US cast-iron staircases intended for public use. These stairs, and more so, its "iron roof," were deemed noteworthy at the time but eventually forgotten. This article explores the historical context in which the use of iron roof and stair systems arose and suggests a possible link to the first referenced significant use of iron by Ammi B. Young, the influential Architect of the U.S. Treasury, who oversaw the design and construction of many conspicuous federal buildings incorporating iron throughout the country from 1852 to 1862. The article also identifies several earlier, no-longer extant US buildings with wrought-iron roof trusses or iron staircases not previously known or recognized in contemporary scholarship. In addition, it identifies the extant iron roof system of a custom house, completed just prior to Young's appointment, whose unusual roof design has not been previously considered or appreciated in the literature.
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