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Figure 15 Picture

Figure 15

Figure 15. K. Grein’s photometer invented and made by Klaus Green in 1912 as part of a series of photometers devised in collaboration with Wolfgang Ewald. This instrument was first tested from the EIDER in 1913 between 500 meters water depth. As a result of these tests, Grein began studies of the penetration of ultra-violet light into the sea.

Photo Category: Oceanography - Historical instruments

Author: P. Roggero/Oceanographic Museum of Monaco/ NOAA

License: Public Domain Mark 1.0 (Public domain)
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18th October 2015
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