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![Figure 15 ship4018.jpg Figure 15](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4018.jpg?itok=Bool8sMY)
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Figure 15. K. Grein's photometer invented and made by Klaus Green in 1912 aspart of a series of photometers devised in collaboration with Wolfgang Ewald.This instrument was first tested from the EIDER in 1913 between 500meters water depth. As a result of these tests, Grein began studies of thepenetration of ultra-violet light into the sea. (Image credit: Oceanographic Museum of Monaco | P. Roggero)