“Speeding the Parting Guest,” Feb. 25, 1909
“A Decidedly Mixed Drink,” April 6, 1899
Isometrical View of Fairmount Water Works, 1843
Bacteria in Delaware River, Torresdale Filters, 1913
PWD water tech at the Philly Home Show, 1960 (detail)
Lab tech, water cleaning demo, Philly Home Show, 1960
‘Gillette, All By Himself, Gets Fine New Idea On Germ Slaying’
Torresdale Conduit work gang, 12/18/1906
Belmont Filters construction, 1903
Finished Upper Roxborough filters, 1903