Official book of the Fair An Introduction to a Century of Progress Internation

Cover Official book of the Fair An Introduction to a Century of Progress Internation
Official book of the Fair An Introduction to a Century of Progress Internation
Ill Century of Progress International Exposition 1933
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A switch is thrown and this blue vault becomes a firmament of twinkling stars.
The voice of the lecturer is heard, explaining the won- ders of the drama of the heavens. Behind his desk a switchboard is concealed that gives him absolute control over the intricate apparatus.
So flexible is this apparatus that, with a slight adjust- ment of the motors, the demonstrator can experiment with this man-made universe as he wills. Spectators may look backward or forward in time, depending on the operator
.... How did the heavens appear when Christ walked on Earth! How did the sky appear at the time of Galileo? Which star will be the Pole Star a thousand years hence?
Or, the lecturer may show the spectators how eternal Spring, Summer or Winter, or eternal noonday can be astronomically realized. He can transport them visually to the tropics and show them constellations they have never seen before, or to either the North or South Pole where the celestial bodies simply swing around forever in circles, without rising or setting.


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