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![Figure 14 ship4017.jpg Figure 14](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4017.jpg?itok=_2uuFLwp)
Description
Figure 14. W. F. Ewald's and K. Grein's photometer. Left: view of theapparatus. Right (from top to bottom): messenger container; removable photographic plates; removable filters. This instrument was designed byWolfgang F. Ewald with the aid of Klaus Green. It was first tested off Capriand put to the definitive tests off Monaco in up to 500 meters. (Image credit: Oceanographic Museum of Monaco | P. Roggero)