Page:Dictionary of aviation.djvu/267

 DICTIONARY OF AVIATION 243

wash we:$ n. the broken or eddying air which is left behind by a flying aircraft or by its propeller; the ded^water or eddy^air in the rear of a moving aerofeil or streamline body, compare wake.

waste-valve 'weest,vaetv n. [also spelt wastetvalv] a valv, as in the gasbag of a balloon, thru which gas may be allowd to escape or go to waste; an escape^valv.

water-anchor 'wc:-t3z,aer)k3z n. a special ferm of anchor adapted for retarding the speed or influencing or arresting the motion of a balloon passing over the sea or other bedy of water.

water-area 'wc:-t9z,e:-zi-9 n. [also spelt water area'} the area, surface, or region of the water as distinguisht from the land or air; also, an area or tract of water, compare landfarea.

water-ballast 'wc:-t3z,baefost n. (seatterm) ballast which consists of water; water used for ballast in a ship.

water-blink 'wci-taz^bhrjk n. a spet of cloud hanging in arctic regions over open water, the presence of which it servs to indicate, compare snowfblink.

water-cloud 'wc:-t3zr,ki,aod n, any one of the class of clouds comprizing all but the highest (cirrus) clouds and the cirro? nebulae, whose component particles are minute droplets of water: distinguisht from icetcloud.

water-drag 'wc:-t3z,dr3eg n. a drag or device attacht to a balloon by a rope and designed for trailing along in the water beneath, as an aid in controlling the motions of the craft.

water-dropper 'wc:-t3z,drep3z n. a cylindric water^con- tainer from whose nezzle the water is allowd to drep freely into the atmosfere. The device was invented by Sir William Thomson and is used, as in a balloon, in mesunng the electric potential of the air.

water-flight 'wc:-t9z,ftait n. a flight over the water; a flight thru the air above a water^surf ace ; an over^water or tjansaquatic flight, compare landfflight.

water-foot 'wc:-t3z,fut n. a foot or footelike understjucture in a flying^machine designed to enable the craft to rest or alight upon a water^surf ace ; a water^float attacht to the. base of a f lying^machine ; a water^skid.

water-haze 'wcr-taz^heez n. atmosferic haze which is made up of particles or minute droplets of water, with or with- out an admixture of dust or smoke; aqueous haze, com- pare dustthaze.

water-particle 'wct-ta^pazti-kal n. one of the particles or

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