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Figure 13. R. Bertel's spectograph invented by Rudolph Bertel in 1910. Thisinstrument was designed to study the penetration of the various wavelegths oflight into the waters off Monaco. The first test of this instrument was aboardthe EIDER off Monaco in 1911 in 500 to 600 meters water depth. (Image credit: Oceanographic Museum of Monaco | P. Roggero)