pneumatic drill
Drill operated by compressed air, used in mining and tunnelling, for drilling shot holes (for explosives), and in road repairs for breaking up pavements. It contains an air-operated piston that delivers hammer blows to the drill bit many times a second. The French engineer Germain Sommeiller (1815–1871) developed the pneumatic drill in 1861 for tunnelling in the Alps.
© RM 2010. Helicon Publishing is division of RM.
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