The tower was designed as the centerpiece of the 1889 World's Fair in Paris and was meant to commemorate the centennial of the French Revolution and show off France’s modern mechanical prowess on a world stage.
According to science all metals are subjected to expand during the summer, for example the same expansion cause bridges to collapse if not well set with expansion space. Why because it contains metals.
The eiffel tower was made of wrought iron lattice so during summer, heat cause it to expand and for that it grows taller.
There's no much theory none mystery behind it, it only the science of heat and expansion.
The two engineers teamed up with French architect, Stephen Sauvestre, on the plans for the monument and entered them into a contest to choose the main attraction of the World's Fair.
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