148 DICTIONARY OF AVIATION
lever-arm, 'hi-vaz/iizm n. the arm which connects one of the controlling-levers, as in a Wright biplane, with the cor- responding lever-crank in the headpiece of the machine.
lever-crank 'hi-vaz^ksaerjk n. the crank or short rotating bar, as in the hed-piece of a Wright biplane, which is con- nected (by means of the corresponding iever-arm) with one of the controlling-levers.
levitation ,levi'tee-S3n n. the action or process of rising in virtue of lightness or buoyancy : the epposit of gravitation.
lifeboat 'laif,boot n. a boat specially constructed for life? saving, as one attacht to an airship at sea, to be used in case of downfall.
lifebuoy 'lai^bou-i n. a life-preserver; a life-belt.
life-kite 'laif,kait n. a kite flown from a vessel wreckt on a lee shore for the purpose of sending a life-saving line to the shore.
life-preserver '}aif-psi,zB:z-v3z n. a lifebuoy; a life-belt.
life-saving 'laif,see-virj adj. organized for or devoted to saving life at sea : as, *life-savmg servis.
lift lift n. (obsolete) the sky; the upper regions; the atmos- fere; the air.
lift hft v.
1. tr. raise into the air; cause to rise; elevate.
2. intr. rise into the air; begin to glide or fly into the air; leave the earth in flight, as an aeroplane flying-machine does just after the get-off.
lift lift n. the action or mode of lifting in or into the air; a rising, a raising; elevation; tendency to lift or rise, as of a balloon; lifting-power; specifically, the force with ichich a fluid, as the air, presses vertically upon an aero- foil, aeroplane, kite, or airship; the vertical component of the air-pressure upon an airship; the vertical component of the poll en a kite-string.
2. a going up, as of a passenger in a balloon; an ascent into or thru the air; an air-tr,ip.
lifter 'liftez . something which lifts or is used in lifting or raising : as, both surfaces act as *lif ters.
lifting-capacity 'hftirj-ka^aesi-ti n. capacity or ability to lift or raise or rise into the air; lifting-power.
lifting-effect 'hftirj-i,fekt n. the effekt or result of lifting or raising; raising-effect.
lifting-force 'hftirj,fo:zs n. force applicable to or tending to lift; lifting-power.
lifting-power 'liftin,pau-3z . power or capacity to lift or raise (an aeroplane or airship) in the air; lifting-force;
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