Science: SARAH

During the Battle of Britain, when airmen parachuted by the dozens and scores into the choppy waters of the English Channel, the R.A.F. was never quite satisfied with its, search & rescue gear. The keenest eyes and the most sensitive radars often missed the tiny, bobbing targets made by helmeted heads and yellow Mae Wests.

Last week, more than a dozen years after the R.A.F.'s heroic tangle with the Luftwaffe, Ultra Electric Ltd.. a London television manufacturer, announced that its engineers have finally built a reliable gadget for finding lost flyers. For more than 200 NATO delegates at the Royal Aircraft Establishment...

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