Word: signalizes
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Dates: during 1950-1959
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...street corners. Half an hour before strike time, steel shutters slammed down on store fronts, and the usual bumper-to-bumper downtown traffic dwindled away to eerie emptiness. Then, from steeple after steeple, bells clanged out the Roman Catholic Church's defiance of the dictator and the signal for the strike to start. Auto horns, usually muted under threat of a $100 fine, hooted in derisive chorus across the city...
White-maned, Yankee-hating Edmund Ruffin watched the signal shot burst over Charleston harbor, seeming to trace in its flame the palmetto emblem of South Carolina. He had left his Virginia plantation, carrying with him a pike appropriated from John Brown's abolitionist band (its Ruffin-inscribed label: "Sample of the favors designed for us by our Northern brethren"), to see his dream of disunion come true. This-4:30 a.m.. April 12, 1861-was his great moment. Edmund Ruffin stepped proudly forward, pulled the lanyard of a columbiad and sent the first of some 600 rebel shells...
Never had Castro taken such chances, showed such strength. Yet this burst of force probably grew out of frustration and disappointment. Castro was tired of waiting for the people to rise up to drive out Dictator Fulgencio Batista. Last week's attacks may well signal that his rebellion has entered a new. tougher and riskier phase. From the hills Castro sent word: "Until now we have spared the cities. But now we realize we must carry the fight to the cities as well as the countryside...
...free Sputnik detector, Dr. Kraus, 47, uses the 20-megacycle radio time signal sent out 24 hours a day by the National Bureau of Standards' station WWV near Washington, D.C. In daytime the signal reflects strongly from the ionosphere, but at night the ionosphere is less effective, so the signal gets much weaker. When a small meteor streaks across the sky, it leaves behind it a trail of ionized air that acts as a small reflector. The ionized air increases the strength of the Washington time signals for a couple of seconds...
...when Sputnik I took to space, he went after it, antenna pointing like a hunter zeroing in on a duck. The satellite, moving at near meteor speed, and much bigger than common meteors, performed magnificently, leaving an ionized trail at each night passage. The trail reflected the time signal strongly for as much as a minute. The bursts of reflected waves came from just the right places and at just the right times to fit the satellite's slowly shifting orbit...