When French engineer Gustave Eiffel built this tower for the Paris World’s Fair of 1889，it was controversial．The iron structure contrasted(对比)sharply with the historic stone buildings of Paris．Eiffel’s four-legged iron archway was supposed to last only 20 years．That’s when Eiffel’s permit to operate the building would expire(过期)and the city could choose to tear it down．

　　Yet from the beginning．Eiffel had a strategy to save his building．If the Tower was linked

　　to important research，he reasoned，no one would dare to take it down．So he would make it a

　　grand laboratory for science．

　　Scientific research began just one day after the Tower opened to the public on May 6，

　　1889．Eiffel installed a weather station on the Tower’s third(and highest)floor．He connected

　　instruments by wire to the French weather bureau in Paris．With these，he measured wind speed

　　and air pressure．

　　In 1903，still worried that his building might be torn down，Eiffel got a clever idea．He

　　asked the French military to conduct its own research on radio communications at the Tower．He even paid the army’s costs．

　　French army captain Gustave Ferrié worked from a little wooden house at the base of the

　　Tower's southern pillar．From there，he made radio contact with forts around Paris．Convinced of the importance of radio communications，the army set up a permanent radio station at the

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