Topics Technology & Engineering

Tinted image of a single-arch bridge over a river with landscape in the distance

Lancaster/Schuylkill Bridge (Upper Ferry Bridge)

View of Fairmount Water Works, ca. 1827

Two black-and-white photographs of pipeline construction on State Road. Depicted are a group of people, trees, buildings, a fire hydrant and a grid of boards over the pipes.

State Road triple pipeline construction, 1904

Eleven men in a work gang plug leaks in a tunnel, the Torresdale Conduit

Torresdale Conduit work gang, 1906

Black-and-white photograph showing the completed Upper Roxborough Filter system. Vaulted concrete ceiling with beds of filter sand.

Upper Roxborough Filter Beds Complete, 1903

1902 photo of Upper Roxborough Filter beds under construction

Upper Roxborough Filter Bed Construction, 1902

Jonval Turbines at New Mill House, 1870