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The swinging tower
The puddled iron of the Eiffel Tower reacts to temperatures by thermal contraction or expansion. The monument can lose up to 8 cm in height when temperatures reach 14°F (-10°C). Above 104°F (40°C), the iron expands and the expansion follows the sun’s rays. The tip of the antenna can make an ellipse of up to 15 cm per 24 hours: the Iron Lady is then said to flee from the sun. The record tilt was set in 1976, a year of great heat wave, when it reached 18 cm. Strong winds also cause it to move, as in 1999 when the storm Lothar moved its top by 13 cm.
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