Figure 1. A plastic Secchi disk of recent origin. This disk is lowered in the water until it disappears from sight. The depth at which it disappears is a measure of the water’s transparency. Father Angelo Secchi devised this method in 1865 and tested it aboard the Vatican vessel IMMACOLATA CONCEZIONE. Several models were tested of different colors.
Photo Category: Oceanography
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Added On | 18th October 2015 |
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