The building of Mount Rushmore was a remarkable feat of engineering. It is a mountain literally made of granite and the only way to carve it was with dynamite. They loaded the TNT into the granite was to drill holes that were then packed with wet sand and dynamite. Thousand of holes were honeycombed into the rock. Workmen dulled hundreds of drill bits a day that had to be sharpened again and again. Pictured are a few bits, hammers and chisels used in the process.
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