Turbidity Gauge

Turbidity Gauge

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Usage conditions apply
In 1903, a water engineer named Allen Hazen described a stick for measuring turbidity that he had designed for the U.S. Geological Survey. In principle, wrote Hazen, “it depends upon the distance beneath the surface of the water at which a platinum wire one millimeter in diameter can just be seen, the light being full and strong, but not direct sunlight.” The Water Resources Branch of the U.S.G.S. transferred this example of that instrument to the Smithsonian in 1908.
Ref: Allen Hazen, “The Physical Properties of Water,” Journal of the New England Water Works Association 17 (1903): 21-27.
Currently not on view
Object Name
Turbidity Gauge
overall folded: 2 in x 1 in x 8 1/4 in; 5.08 cm x 2.54 cm x 20.955 cm
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catalog number
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Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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