Page:Dictionary of aviation.djvu/174

 150 DICTIONARY OF AVIATION

aleng the length of an aerial screw-propeller blade, com- pare thrusttgrading and linear grading.

load-value 'lood/vaelio n. the value or amount of the load or normal external pressure, as upon the blade of a propeller.

locomotion ,lok9'moo-$an n. motion from place to place; the action or power to move from one place to another; -pro- gressiv movement.

lofty 'le:f-ti adj. very high in air; extending to or existing at great elevations; taking place or occurring at great alti- tudes : as, his *lefty car; birds of *lofty wing.

log-book 'leg,bok n. a book in which the particulars of a balloon-tgip or airship-flight are enterd or kept.

longitude 'Iend3i,tc.ud n. distance east or west mesured in degrees along the parallel of latitude vertically below the observer en the surface of the earth, especially the angular distance (of the plane of the meridian of any peint, place, or position on or above the earth's surface) east or west from the plane of some standard meridian (such as that of Greenwich, England).

loom loum n. same meaning as looming.

looming 'lou-mit] n. a form of mirage in which a distant object, as a ship at sea, appears abnormally elevated, and often inverted and vertically magnified.

low foo n. an area of low barometric pressure, bounded by an isobar; a cyclone.

low-flying 'loo,fi,ai-ir) adj. habitually flying low or near the ground; used to flight at small altitudes.

low-hanging '}oo,haerjir) adj. hanging low; suspended at a relativly small altitude : as, *low-hanging clouds.

low-lying 'loo^ai-irj adj. lying low; located at a relativly small altitude above the earth's surface: as, *low2lying fegs and clouds.

loxodrome 'Ieks9,drom n. a line on a sferical or sfereidal surface (as the earth) which cuts the meridians at a con- stant angle; a lexodremic spiral; a rhumb-line.

lozenge 'lezinds n. a plane figure, ferm, or shape, having four equal straight sides and two obtuse angles, as of cer- tain kites; an oblique equilateral parallelogram; a diamond:? shaped plane figure.

lubrication ,liubi'kEe-$3n n. the act of lubricating; the process of making smooth or slippery the joints of the en- gin or driving-mechanism of an airship, as by means of eil, for the purpose of diminishing friction; also, the state or condition of being lubricated. forced lubrication, lubrication by means of 91! which is

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