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wind direction indicator

aviat., canad. manche à vent
sciences., techn. indicateur de direction du vent
transp. indicateur de direction de vent
 Anglais glossaire
wind direction indicator
aviat., canad. An indicator that is in the form of a truncated cone made of fabric and that is not less than 12 ft long and, at the larger end, not less than 3 ft in diameter, so constructed as to give a clear indication of the direction of surface wind and a general indication of wind speed; An actuated device for indicating visually to aircraft the direction of surface wind
Wind Direction Indicator
météor., abrév. WDI