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
4/4/2019 2:12:17 PM
Photographer: Y. Berard
Credit: Oceanographic Museum of Monaco
Subject: Oceanography
Subject: Historical instruments