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single-jack
Mining
DCHP-1 (pre-1967)
Entry from the DCHP-1 (pre-1967)
This entry may contain outdated or offensive information, terms, and examples.
n.
a relatively small hammer used in single jacking.
Quotations
1961
The mechanization of mines in 1890--the replacing of hand-steel, single jack and double jack, by drilling machines--had created new problems. . . .
1964
The miner, working either a double-jack or single jack job, might worry about the sprags. . . .