WhatRadarDoes.—Radarisanadditiontoman’ssensoryequipmentwhichaffordsgenuinelynewfacilities.Itenablesacertainclassofobjectstobe“seen”—thatis,detectedandlocated—atdistancesfarbeyondthoseatwhichtheycouldbedistinguishedbytheunaidedeye.This‘(seeing”isunimpairedbynight,fog,cloud,smoke,an