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Description
Figure 1. A drilled roller (round boulder) used as a sounding weight. Figure 2. Ordinary sounding lead weight, sometimes attaining many kilograms. The leaddates from the Christian era. The trapezoidal form with a recess for tallow and acquiring bottom samples dates from a few centuries back. In this form, millions of sounding were made. Fig. 3. French sounding lead used in many expeditions. (Image credit: Oceanographic Museum of Monaco | Y. Berard)