pl23_ship4454.jpg

Figure 1

Image

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https://www.noaa.gov/media/digital-library-photo/pl23ship4454jpg

Description

Figure 1. A plastic Secchi disk of recent origin. This disk islowered in the water until it disappears from sight. The depth at which it disappears is a measure of the water's transparency. Father AngeloSecchi devised this method in 1865 and tested it aboard the Vatican vessel IMMACOLATA CONCEZIONE. Several models were tested of different colors.

Credit

Oceanographic Museum of Monaco

Photographer

Y. Berard

Collection

Voyage to Inner Space
History of Oceanography Collection
The Early Instruments - Collections of the Oceanographic Museum at Monaco
Supplemental Material, Demonstration Equipment, and Meteorological Instruments

Keywords

Oceanography