JACK n.
at 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 often given to a jackscrew, whi…
LAND n.
tions, perforations, or grooves, that part of the surface which is not so treated, as the level part of a millstone between the furrows, or the surface of the bore of a rifled gun between the grooves. Land agent, a person employed to sell or let land, to collect rents, and to attend to other money matters connected wit…
LIFTING a.
, or valved piston, instead of a solid piston, for drawing water and lifting it to a high level. (b) A pump which lifts the water only to the top of the pump, or delivers it through a spout; a lift pump. -- Lifting rod, a vertical rod lifted by a rock shaft, and imparting motion to a puppet valve; -- used in the engin…