English
资源说明：What Radar Does. —Radar is an addition to man’s sensory
equipment which affords genuinely new facilities. It enables a certain
class of objects to be “seen” —that is, detected andlocated—at distances
far beyond those at which they could be distinguished by the unaided
eye. This ‘(seeing” is unimpaired by night, fog, cloud, smoke, and most
other obstacles to ordinary vision. Radar further permits the measurement
of the range of the objects it “sees” (this verb will hereafter be used
without apologetic quotation marks) with a convenience and precision
entirely unknown in the past. It can also measure the instantaneous
speed of such an object toward or away from the observing station in a
simple and natural way.
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