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Pittsburgh Aqueduct 
Name: Pittsburgh Aqueduct
Collection: Vogel Slide Collection
Site: Pennsylvania Canal
Unit: 7
Piece: 2-47
Structure: Aqueduct
Photo credit: Robert M. Vogel
Photo date: 0000-00-00
Notes: Photograph of historic diagram of the trunk of the Pittsburgh Aqueduct. The aqueduct was designed by John A. Roebling and completed May of 1845. The aqueduct had seven spans of 162 feet
http://www.clpgh.org/research/pittsburgh/patentees/roebling.html