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Scientific American, Vol. 36, No. 23 (1877) (1877)
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each side of the opening, feet in length, 12 inches thick, with inside flanges 2% inches wide by 12 inches thick at top and-bottom of each section. A. D isa double valve which may be adjusted to rest upon The flanges are pierced with holes 5 inches apart, from cen- the lower seat, and so close the… … SOUTH STREET BRIDGE, PHILADELPHIA, PA. © 1877 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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