hammer pick

hammer pick

[′ham·ər ‚pik]
(mining engineering)
A pneumatic hand-held machine used to break up the harder rocks in a mine; consists of a pick which is driven by a hammer set in a cylinder which receives compressed air.
References in periodicals archive ?
The first important book in English on Akiva was by Louis Finkelstein in 1962, he says, but that was an comprehensive and encyclopedic integration of all the sources, whereas Hammer picks his sources carefully, focusing on only certain aspects.