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Figure 47. Sigsbee sounding machine, designed by Lieutenant Charles D. Sigsbee, USN. Sigsbee's sounding machine was constructed on the basis of the Thomsonwireline sounding machine. The Sigsbee apparatus represents the first realindustrial construction of such a device. It was the prototype for the majorityof wireline machines subsequently invented and used. (Image credit: Oceanographic Museum of Monaco)