jack post


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jack post

[′jak ‚pōst]
(mining engineering)
Timber used where a coal seam is separated by a rock band and one bench is loaded out before the other.

jack post

A post comprising two telescoping sections, so that it is adjustable in height; used to support a floor beam.
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It seeps through dirt floors, solid floors, gaps in suspended floors, gaps around service pipes, cracks in concrete walls, sumps, joints, basement drains, under the furnace base and jack posts if the base is submerged in the floor.