Science: Eagle-Eyed Shoran

Army radar men told proudly last week of another of radar's triumphs. One of its varieties, "shoran," could measure long distances on the earth's surface "within a few feet of perfect accuracy." This meant that the world's maps could be checked, and unmapped areas mapped, with greatly increased ease.

Shoran, like most radar devices, is simple in principle. A transmitter in a highflying airplane shoots bursts of radio waves at a station on the ground. The station picks up the signals, rebroadcasts them to the plane. An electronic gadget measures in micro-seconds (millionths of a second) the time they take for the...

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