>> Monday, December 13, 2010
The Eiffel Tower is constructed of lattice work structure made of wrought iron. Wrought iron is a material that can last forever if it is painted regularly. Since it was built for the International Exhibition of Paris in 1889, it has been painted every 7 years to prevent it from rust. It took 2 years to complete the structure. It was the world's tallest structure until Crysler building completed in New York, USA in 1930. The tower weighs 7000 tons and stands 324 metres high including the anttenna. It used about 18,000 pieces of iron held together by 2.5 million rivets.
The Eiffel Tower was one of the first tall structures in the world to contain passenger elevators. Eiffel was one of the first engineers to recognize the importance of wind forces on tall structures.The open lattice works allows wind to pass through. Thus it is very airy and resistant to the wind forces.
Open-lattice wrought iron structure
The Tower is also known as Iron Lady or 'La dame de fer'. It was built to
celebrate the centennial of the French Revolution in 1889.