General view of laboratory technician Richard Thomson preparing water samples for testing at the New York City Bureau of Water Supply's Ben Nesin Laboratory. Per notations accompanying the photograph, a Perkin-Elmer Model 303 Atomic Absorption Spectrophotometer is used to determine the presence and measure the quantity of trace elements in the water.
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Perkin-Elmer Corporation. “Perkin-Elmer Atomic Absorption Spectrophotometer in Use at Bureau of Water Supply,” 1970–1979. Photographs from the Perkin-Elmer-Applera Collection, Box 4. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/rr171z14n.
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