National Geographic : 1947 Oct
496 The National Geographic Magazine *r To Determine Wind Direction Aloft, Weather Men Released Balloons During progress through the ice pack balloons were sent up daily. Their flight could be followed for miles in the exceptionally clear, dust-free Antarctic atmosphere. When clouds did prevent observation, meteorologists used balloons bearing radar tracking targets, like the one mistaken for a "flying saucer" last summer (page 511). I-.