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Broken sand and shells was and still is a description used by sailors for the material that is sometimes found in the bottom of a draft gauge. This tool was first used on sailing ships but most modern vessels use sonar depth finders. The premise behind the depth gauge is simple. One would take a lead weight and tie it to the end of a rope that had knots tied in one fathom intervals. The weight would be lowered into the water until it touched the bottom. However many knots had passed thorugh the users hand determined the depth of the water. Upon pulling the weight back onto the deck, the user would check the bottom of the weight where there was a small indentation. The report to the officer in charge would be determined by what was in the indent, which was sometimes 'sand and broken shells'.

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Q: What does Broken Sand and Shell mean?
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