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Description
Figure 56. Pecoul logging sounder, invented in 1849 by Master Mariner AdolphePecoul of Marseille. This device was used to measure measure depths while avessel was underway or to be used as a speed logging device. It was tested in1850. In spite of favorable reports from numerous ship captain, it was rejected by the Ministry of the Marine and Colonies. (Image credit: Oceanographic Museum of Monaco | Y. Berard)