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Secchi in ice

French La traduction française de cette page n'est pas disponible.

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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Preparing for the Northwest Passage

French La traduction française de cette page n'est pas disponible.

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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