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Examples
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In particular, data using an instrument called a Secchi disk, which measures the transparency of ocean water.
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The so-called Secchi disk is still used today to measure water transparency, and the old data he collected remains enormously valuable for marine biologists.
Free Internet Press 2010
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They examined a half-million data points collected using a tool called a Secchi disk, as well as measurements of chlorophyll-a pigment produced by the plankton.
Scientific American 2010
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The disk is lowered into the lake and the depth at which the disk disappears from sight is referred to as the Secchi depth.
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UC Davis researchers measure Lake Tahoe's clarity with a white, dinner-plate sized disk - known as a Secchi disk - every seven to 10 days at two fixed locations.
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UC Davis researchers measure Lake Tahoe's clarity with a white, dinner-plate sized disk - known as a Secchi disk - every seven to 10 days at two fixed locations.
Nevada Appeal - Top Stories BY Adam Jensen Nevada Appeal News Service 2009
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Dr. WORM: The Secchi disk is a beauty because it's the simplest oceanographic instrument.
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In 1640 Father Secchi saw one in a cemetery near Florence and frightened it away with the sign of the cross.
Archive 2009-04-01 Dark Worlds Club 2009
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In 1640 Father Secchi saw one in a cemetery near Florence and frightened it away with the sign of the cross.
Supernatural Does Ghouls Dark Worlds Club 2009
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Some lakes have low color and high Secchi values, while other lakes that receive drainage from the Green Swamp (75-26), such as Lake Louisa, are very dark.
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