JACK n.
nstructed, for exerting great pressure, or lifting or moving a heavy body through a small distance. It consists of a lever, screw, rack and pinion, hydraulic press, or any simple combination of mechanical powers, working in a compact pedestal or support and operated by a lever, crank, capstan bar, etc. The name is ofte…
JUPITER n.
n diameter being about 85,000 miles. It revolves about the sun in 4,332.6 days, at a mean distance of 5.2028 from the sun, the earth's mean distance being taken as unity. Jupiter's beard. (Bot.) (a) A South European herb, with cymes of small red blossoms (Centranthus ruber). (b) The houseleek (Sempervivum tectorum); --…