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Post Info TOPIC: The Secchi disk
Blobrana


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 Taking a Secchi Disk Reading 



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Blobrana


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The Secchi disk, created in 1865 by Pietro Angelo Secchi SJ, is a circular disk used to measure water transparency in oceans and lakes. The disc is mounted on a pole or line, and lowered slowly down in the water. The depth at which the pattern on the disk is no longer visible is taken as a measure of the transparency of the water.
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