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Figure 51. HIRONDELLE II sounding machine used by Prince Albert I of Monaco.This machine represented the evolution of a number of sounding machines used byPrince Albert I since first having a wireline machine installed on the HIRONDELLE. The first machine was wound back in by hand, but subsequent models had steam engines for winding in. The engineer Jules Le Blanc built these machines. (Image credit: Oceanographic Museum of Monaco | Y. Berard)