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Description
Figure 40. Fol bathometer, designed by Hermann Fol who was a collaborator withPrince Albert I of Monaco. This instrument used the same principle as the Ericsson sounder. Fol replaced water with mercury in order to determine the depthattained as a function of the quantity of liquid displaced by the pressure.Details concerning tests and effectiveness of this device are unknown. (Image credit: Oceanographic Museum of Monaco | Y. Berard)