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NOAA Photo Library Image - ship4454

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.

Image ID: ship4454, Voyage To Inner Space - Exploring the Seas With NOAA Collect
Photographer: Y. Berard
Credit: Oceanographic Museum of Monaco

Category: Oceanography/

High Resolution Photo Available

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Last Updated:
June 10, 2016