Word: warn
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Dates: during 1960-1960
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...flight itself. Hunched over green-glowing radarscopes in 35 stations across the nation stand ARTC (Air Route Traffic Control) men, who follow and guide airplanes flying through heavy weather or at sky-streaking altitudes on Instrument Flight Rules. Moving their transparent markers ("shrimp boats") alongside little blips, they warn of nearby traffic, give directions, order changes in headings and altitudes. If a plane is a 550-m.p.h. jet, the controller gives the pilot 100 miles' clear space ahead, 100 behind; prop-driven planes get 35 miles. Through controllers and towers, miles of Teletype wire and a host of electronic...
When a "big one" is scheduled for a night test, a honking sound beats for a few minutes over the still desert to warn the unwary. Then privileged watchers inside the fence feel the ground tremble under their feet, see a long, white, incredibly brilliant flame jut horizontally out of the hillside. The show lasts for about one minute and shuts off abruptly. There is no fuss, no dramatic countdown, seldom any delay...