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Show World History Put on Tap for Button Pushers Here's what pushing a button will get you now in the halls of Griffith observatory: A history of the world presented orally and visually in four minutes! min-utes! Source of this condensed panorama pano-rama of the past is the cosmochron or "clock of the ages," constructed in the observatory shops. The "clock" is 10 feet wide and 8 feet high, with a dial 4 feet in diameter in the center. The dial has illuminated sections to represent the geological ages. Two hands turn on the dial. The shorter hand turns once for each 100,000,000 years of geological time, while the longer hand makes one turn for the complete geological history his-tory of the world. As the hands turn, a series of 44 pictures is flashed on a screen on the dial's face to show scenes at the time being indicated. At the same time the voice of Dr. Chester Stock, Caltech scientist, paints a word picture of the changes and the reasons "behind them. |