State Street pipeline construction, 1904
Belmont Filters construction, 1903
Finished Upper Roxborough filters, 1903
Upper Roxborough filter beds under construction, July 1902
Rudolph Hering
Outhouse over the Schuylkill near Pottstown
McConnell Germ-Proof Filters ad
Bureau of Water Spring Garden Testing Station, 1901
Northern Liberties and Spring Garden Water Works
Apparatus for testing model turbine wheels used at Fairmount, 1859-60
