JACK n.
A portable machine variously constructed, 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, cap…
JEWISH CALENDAR n.
he harmonious arrangement of festivals, etc., so that no simple perpetual calendar can be constructed. The following table gives the months in order, with the number of days assigned to each. Only three months vary in length. They are: Heshvan, which has 30 days in perfect years; Kislev, which has 30 days in regular an…
KINDERGARTEN n.
fying and cultivating the normal aptitude for exercise, play, observation, imitation, and construction; -- a name given by Friedrich Froebel, a German educator, who introduced this method of training, in rooms opening on a garden.
LAW n.
In arts, works, games, etc.: The rules of construction, or of procedure, conforming to the conditions of success; a principle, maxim; or usage; as, the laws of poetry, of architecture, of courtesy, or of whist.
LEAF n.
cut rounded pieces from the edges of leaves, or the petals of flowers, to be used in the construction of their nests, which are made in holes and crevices, or in a leaf rolled up for the purpose. Among the common American species are M. brevis and M. centuncularis. Called also rose-cutting bee. -- Leaf fat, the fat w…
LEVY v.
To erect, build, or set up; to make or construct; to raise or cast up; as, to levy a mill, dike, ditch, a nuisance, etc. [Obs.] Cowell. Blackstone.
MACHINE n.
a lever arranged to turn about a fulcrum or a pulley about its pivot, etc.; especially, a construction, more or less complex, consisting of a combination of moving parts, or simple mechanical elements, as wheels, levers, cams, etc., with their supports and connecting framework, calculated to constitute a prime mover, o…