 
		 
		 
		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
 
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