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hammerpick |
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A compressed-air-operated hand machine used by miners to break up the
harder rocks in a mine. It consists mainly of a pick and a hammer operated
by compressed air. The hammer driving the pick is set in a cylinder, where
the compressed air enters and presses the hammer, which in turn drives the
wedge-shaped edge of the pick into the rock in short sufficient shocks of
from 1,500 to 2,000 blows per minute. See also: poll pick Stoces
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