Isometrical View of Fairmount Water Works, 1843
Centre Square Engine House, ca. 1807
Thomas Run sewer outlet at Cobbs Creek
Thomas Run sewer outlet during construction
Cohocksink Sewer System outlet at Laurel Street
Wood truss drawbridge, Orthodox Street over Frankford Creek, 1899 [Detail]
Wood truss drawbridge, Orthodox Street over Frankford Creek, rebuilt 1899
Bridge Street Draw, view through bridge, July 26, 1897
Bridge Street Draw, draw partly open, July 26, 1897
Bridge Street Draw with draw open, July 26, 1897