Sounding Lead, John Ericsson, c. 1836 - c. 1860 sounding lead Datplood with a sling. The lead contains a glass tube with a brass bowl next to it, which indicates the depth by water that penetrates into the tube. The tube has applied for this under a crane, in a circular formation of the lead of the lead. The glass tube and dish can be covered with a semi -round iron plate. At the bottom of the lead is a hole for taking soil samples. United States of America lead (metal). brass (alloy). iron (metal). glass. rope. leather

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