Plumb, originating from seafaring, plumb measuring instrument ground find lead metal, cast Lead with round hole at top Rectangular cross section upwards becoming narrower. Cracked marks Shallow hollow at the bottom. Here grease was greased and on the basis of the material that stuck to it, one could determine what the seabed consisted of. Was used in conjunction with rope with knots in it for each fathom one knot on side: lying arrow cross archeology measuring boating shipping gauge maritime

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