…Bridge partially demolished for conversion to siphon New York City’s Landmarks Law establishes Landmarks Preservation Commission 24 1968 Scientific American editorial says proposed High Bridge demolition is “an act of vandalism without precedent in the history of our country…

…A set of planks used to form a dam in a hydraulic system. In the New Ossining Weir, stop planks were used to completely block the flow of water in the aqueduct tunnel. Tweed, William “Boss”: An American politician most…

…Jervis, An American Engineering Pioneer. Ames, Iowa; Iowa State University Press, 1990. figure 19: Possibly by John B. Jervis. Elevation of Regulating Gates at Croton Dam, c.1841, watercolor and ink on paper Courtesy Jervis Public Library, drawing #189 (different…