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Philadelphia Water Department
PWD Drinking Water Treatment diagram
“Speeding the Parting Guest,” Feb. 25, 1909
Typhoid fever deaths, 1860-1936
“A Decidedly Mixed Drink,” April 6, 1899
Steam engine drawing, Frederick Graff Sr., 1815
1903 Proceedings of the Engineers’ Club title page
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
Upper Roxborough filter beds under construction, July 1902
A.C. Abbott, MD
Bureau of Water Spring Garden Testing Station, 1901
Engine House of the Belmont Works
36. [Laboratory] Left to right: raw water, settled water, filtered water, ca. 1943
35. [Laboratory] Turbidity test ca. 1943
Laboratory Alkalinity test, ca. 1943
33. [Laboratory] Presumptive coli test
32. [Laboratory] Bacteria count
31. [Laboratory] Taste and odor test
29. Water sample collector [for laboratory]
11. Taking a water sample for laboratory ca. 1943
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