


Effects of Expansion of Gas Bubbles in Enscher Sludge Shown in Right-Hand Cylinder

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

Swimmers at Pier 126, Delaware River, July 15, 1918

Allegheny Avenue Sewer at Pier 126, 1918

Devereaux Street Sewer, Philadelphia magazine, 1911

Privy Regulations
