PWD Drinking Water Treatment diagram
Steam engine drawing, Frederick Graff Sr., 1815
Fair Mount Water Works engine house, 1819
Wooden Water Pipe, removed from Market Street, December 6, 1901
Bethlehem Water Works, 2011
Schuylkill River Hydrographical Survey 1861-66 by H. P. M. Birkinbine
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