 
		 
		 
		Schuylkill Navigation lock at Fairmount (Picturesque America)
 
		Plan of Philadelphia, John Hills, 1796
 
		Centre Square Water Works, Drawings of Intake Basin
 
		Centre Square Water Works, Frederick Graff, Sr. Plans, 1799
 
		Centre Square Water Works, Latrobe Plans, 1799
 
		Duplex Pumping Engine, Belmont Works
 
		Fairmount Water Works, about 1860
 
		Showing the method of sinking the pipe on the bed of the river
