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![Figure 20 ship4023.jpg Figure 20](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4023.jpg?itok=aNqhoFi-)
Description
Figure 20. Color measuring lens of Julien Thoulet designed in 1903 as per theintention of Prince Albert 1st of Monaco. Thoulet tested this instrument at the laboratory at Nancy. It is possible that this instrument was also tested onthe PRINCESS ALICE II in 1905. (Image credit: Oceanographic Museum of Monaco | P. Roggero)