The earliest recordings of measuring the clarity of water was by the German naturalist Adelbert von Chamisso during a Russian expedition in 1815–1818. The Secchi disk was invented in 1865 by Pietro Angelo Secchi who …
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All posts about: Plankton 
Rochelle and Secchi disk I created the Secchi disk at my school – Rednock School – in their tech department. We used the laser cutter to cut the 30cm white disk with two …
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