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Figure 58. Albert sounder. The idea of Cardinal Cusanus, mentioned in the previous figure, was re-examined by the Italian architect Leo BattistaAlberti and subsequentlydescribed by Giuseppe Biancani in 1635. The design waseven simpler than Puhler's device. A simple rule of three was devised to derivethe depth from the travel time to the bottom and return of the float. (Image credit: Oceanographic Museum of Monaco | Y. Berard)