Page:Dictionary of aviation.djvu/247

 DICTIONARY OF AVIATION 223

swallow-like 'swelo,laik adj. like that of a swallow: as,
 * swallow4ike stuiftness.

sweep swiip intr. [past participle and preterit swept] move, or glide along with a swift waving or surging movement, as a bird or a machine in flight : as, to *sweep upward.

sweep sump n.

1. the action of the verb sweep ; the direction of any nen# rectilinear motion; the reach or range of a motion or stroke; a turn, bend, or curv; a rapid survey, as of the earth's surface, or of the hevens : as, a wide *su)eep to the left; the *sweep of a wing; beyend the *sweep of the tele- scope; a grand *sweep of mountain country.

2. the area of the vertical cross^section of the moving stratum or layer of air or other fluid which is assumed to be that to whose inertia the supporting^reaction upon an aeroplane or other aerofoil is due : as, the *sweep of an aeroplane; the hypothesis of constant *sweep.

sweep-area 'swiip,e:-H-3 n. the area of the cresszsection of the stratum or layer of air or other fluid which is assumed to be that to whose inertia the supporting^reaction upon an aerofoil is due ; the sweep of an aeroplane.

sweeping 'suni-pirj adj. characterizing the motion of, or de- scribed by a body which sweeps along: as, the aeroplane rose in a *sweeping curv.

swell swet intr. [past participle swelled, sweld, swollen; pret- erit swelled, sweld] grow in bulk; bulge, dilate, expand, belly; also, increase in intensity or force, as the wind does.

swell swel n. the action of the verb swell; a rise, surging, or bulging, as of the air, the water, or the land^surface ; a wave or billow ; a surge ; a bulge : as, the surging land- scape's *su)ell; a hevy *swell of the sea.

swerve SWBIZV intr. [past participle and preterit swerved, swervd~\ turn aside suddenly, as an aeroplane sometimes does from its course.

swerve SWB:ZV n. a sudden turning aside, as of an aeroplane from its course.

swing swirj intr. [past participle swung; preterit swung, swang] move to and fro; oscillate; glide or fly with a free swaying motion : as, twice he *swung round the field.

yearly swing of the atmosphere, the yearly to^and?fro movement of portions of the earth's atmosfere; the annual oscillatory motion of the aerial ocean resulting in accumu- lation of air over the land in winter and over the sea in summer, as shown by changes in barometric pressure.

swirl SWB:Z! n. a whirling motion; an eddy of air; a gyra- tion; a whirl.

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