Ironstone fragment with drill marks
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资源简介：
Found in a spoil heap at Esk Valley Mine near Grosmont. In mid-19th century mining the hole for the gunpowder to blast the stone was made by 'jumping' a chisel ended metal bar into the rock face to create a deep hole. As technology advanced rotary drills were brought in to make the job much easier. Source: Objaverse 1.0 / Sketchfab
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Zenodo创建时间：
2023-12-28
