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 DICTIONARY OF AVIATION 149

hftmg^capacity : as, the *hfting^power of gas; the *liftmg? powers of het air.

lifting-propeller 'hftin-pso,pel9z n. a propeller of an air- ship whose function is to lift or raise the airship in the air; a lifting^screw; a vertical screw.

lifting-screw 'hftirj,sk5ou n. a revolving screw designed for lifting an airship; a gyrating helical aerofoil for raising a flying^machine into or thru the air; a lifting-propeller.

lifting-test 'hftirj,test n. a test or trial of the lifting* powers of a helicopter or other mechanism.

lifting-wheel 'hftirj,umi n. a wheel or screw used to lift or raise an air^machine; a liftmg-screw.

lighter-than-air ,lai-t9z-d3'ne:z, (assumptivly) 'lai-taz-da- ,ne:z adj. possessing less weight in proportion to bulk than the air or atmosfere; of less specific gravity than the air: said of balloons or dirigibles which depend upon gases lighter than the air, or upon ranfied air or a vacuum for sustaining^power : the opposit of heavier -zthantair.

lightning 'lait-nirj n. the visible discharge of electricity be- tween one group of clouds and another or between the clouds and the ground.

ball lightning] lightning in the form of a slowly moving ball of fire which finally explodes, sometimes seen in hevy downpours of rain, and consisting of incandescent ran- fird air and gas.

chained lightning, same meaning as chain lightning, chain lightning, lightning which assumes the ferm of a zigzag or broken line; ferkt lightning. forkt lightning, zigzag lightning; chain lightning. sheet lightning, lightning in which a wide surface is illuminated at once, as summer^lightning or heat-lightning. summer lightning, see summertlightning.

lightning-flash '}ait-nirj,ft3e$ n. a flash or flame of light- ning.

lightning-recorder 'lait-nin-z^keiz-daz n. a modification of a wireless^telegraf instrument which records or indicates the presence of distant lightning.

limbat 'hm,baet n. a cool northwest wind in the island of Cyprus.

line-storm 'lam^toizm n. an equinexial storm.

list hst intr. careen, heel, or incline to one side, as an air- ship in flight: as, initial *hst; augmented *hst.

listing-moment 'hstir),moo-m9nt n. the moment or effect of listing, see list.

load-grading 'lDod,gzee-dirj n. the grading (or rate of vari- ation or change) of a variable load or normal pressure, as

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