Page:Dictionary of aviation.djvu/274

 250 DICTIONARY OF AVIATION

surface, er, especially, relativly to the earth's surface; an atmosfenc current; a current of air as coming from a par- ticular direction; a movement or rush of air relativ to the observer, as when flying thru still air; also, air artificially put in motion, as by bellows or a blower, or by a projectil; an air^current or blast, natural or artificial.

against the wind, in an epposit direction to the wind; in a direction epposit to that in which the wind is blowing; so as to meet the wind.

backing wind, a wind the changing direction of tuhich shifts around the dial of the compass anticlockwise, or against the sun: the epposit of hauling wind.

beating wind, (seazterm) a hed^wind which beats against a vessel and forces it to tack.

before the wind, (seazterm) in the direction in tuhich the wind blows.

Capetown wind, a violent vapor^laden wind which blows down from Table Mountain, epposit Cape Town, South Africa.

cardinal wind, a wind which blows from one of the four cardinal points; a north, south, east, or west wind.

chinook wind, a warm, dry, westerly or northerly wind blowing at intervals en the eastern slopes of the Reeky Mountains, similar to the fohn winds of Switzerland; a chinook.

coastal wind, same meaning as coasttwind.

diurnal inversion of the wind, the inversion or reversal of the relations of the velocities of the winds every twenty? four hours discoverd by Espy in 1840; the law that the wind next the surface of the earth is feeblest at night and strongest at midday, whereas the reverse is tjue at a cer- tain altitude above the surface.

Dove's law of the rotation of the winds, the law or rule, known alredy by Anstetle to be tue (for the Mediterra- nean region) but given wider extension by Dove in 1827, that, in the north temperate zone, the wind^directions at any given place pass thru a cycle of changes lasting only a few days, the order usually being east, south, west, north : that is (en a compass^dial), clockwise, er with the sun.

down the wind, in the same direction as the wind is blowing or moving; with the wind: as, birds fly quickly
 * down the wind.

etesian wind, the regular north and northeast wind blow- ing over the Mediterranean Sea from southern Europe in the summertime, especially in July and August, and appa- rently due to an indraft of air toward the Sahara.

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