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Miner's rock-drill, 1891.

Miner's rock-drill, 1891.
3 1 c m
actual image size: 32cm x 23cm


This tool is also known as an augur, and is used to remove loose material from the hole which it has drilled. This particular example, with a double-bladed cutting tip, is used to cut holes in rocks so that explosives can be inserted. The waste material is carried out of the deepening hole along the grooves of the drill bit, in the same way that water is lifted by an Archimedean screw.

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© Science Museum / Science & Society Picture Library

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