Topics Technology & Engineering

Three reports on Philadelphia’s Sewage Treatment Project, 1911-1914

James W. Phillips Letter Book, 1904-1913

Black-and-white photograph of a man in a hat standing in a brick trench

Grit Chamber, Essen, Germany

Black-and-white photo of heavy machinery

Sludge Presses for Grease Recovery, Bradford, England

Black-and-white image of a tray with three compartments and four small glass cylinders

Drain water from sludges obtained from sedimentation, septic and Emscher tanks

Black-and-white image of a refinery with smokestacks emitting smoke

A Day in the Ma’sh – Oil Refinery

Black and white photo of a low bridge over a creek

Bridge Street Draw, July 26, 1897

Philadelphia Underground, Jan. 29, 1961

“Philadelphia Underground,” Jan. 29, 1961

Color Diagram of Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia

State Street pipeline construction

State Street pipeline construction, 1904

Rudolph Hering

Rudolph Hering

DeLaval Beauty Shots 6

Electric Pump Installations at Lardner’s Point Pumping Station