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t. e. The Weimar Republic, [d] officially known as the German Reich, [e] was a historical period of Germany from 9 November 1918 to 23 March 1933, during which it was a constitutional federal republic for the first time in history; hence it is also referred to, and unofficially proclaimed itself, as the German Republic.
It is widely regarded as one of the most iconic football stadiums in the world, and is considered a hub for the English game. Wembley Stadium is owned by the governing body of English football, the Football Association, whose headquarters are in the stadium, through its subsidiary Wembley National Stadium Ltd (WNSL).
- History
- Design
- Communications
- Dimensions
- Taller Structures
- Tourism
- Illumination Copyright
- Replicas
- See Also
- References
Origin
The design of the Eiffel Tower is attributed to Maurice Koechlin and Émile Nouguier, two senior engineers working for the Compagnie des Établissements Eiffel. It was envisioned after discussion about a suitable centerpiece for the proposed 1889 Exposition Universelle, a world's fair to celebrate the centennial of the French Revolution. In May 1884, working at home, Koechlin made a sketch of their idea, described by him as "a great pylon, consisting of four lattice girders standing apart at th...
Artists' protest
The proposed tower had been a subject of controversy, drawing criticism from those who did not believe it was feasible and those who objected on artistic grounds. Prior to the Eiffel Tower's construction, no structure had ever been constructed to a height of 300 m, or even 200 m for that matter, and many people believed it was impossible. These objections were an expression of a long-standing debate in France about the relationship between architecture and engineering. It came to a head as wo...
Construction
Work on the foundations started on 28 January 1887. Those for the east and south legs were straightforward, with each leg resting on four 2 m (6.6 ft) concrete slabs, one for each of the principal girders of each leg. The west and north legs, being closer to the river Seine, were more complicated: each slab needed two piles installed by using compressed-air caissons 15 m (49 ft) long and 6 m (20 ft) in diameter driven to a depth of 22 m (72 ft) to support the concrete slabs, which were 6 m (2...
Material
The puddle iron (wrought iron) of the Eiffel Tower weighs 7,300 tonnes, and the addition of lifts, shops and antennae have brought the total weight to approximately 10,100 tonnes. As a demonstration of the economy of design, if the 7,300 tonnes of metal in the structure were melted down, it would fill the square base, 125 metres (410 ft) on each side, to a depth of only 6.25 cm (2.46 in) assuming the density of the metal to be 7.8 tonnes per cubic metre. Additionally, a cubic box surrounding...
Wind and weather considerations
When it was built, many were shocked by the tower's daring form. Eiffel was accused of trying to create something artistic with no regard to the principles of engineering. However, Eiffel and his team – experienced bridge builders – understood the importance of wind forces, and knew that if they were going to build the tallest structure in the world, they had to be sure it could withstand them. In an interview with the newspaper Le Tempspublished on 14 February 1887, Eiffel said: He used grap...
Lifts
The arrangement of the lifts has been changed several times during the tower's history. Given the elasticity of the cables and the time taken to align the cars with the landings, each lift, in normal service, takes an average of 8 minutes and 50 seconds to do the round trip, spending an average of 1 minute and 15 seconds at each level. The average journey time between levels is 1 minute. The original hydraulic mechanism is on public display in a small museum at the base of the east and west l...
The tower has been used for making radio transmissions since the beginning of the 20th century. Until the 1950s, sets of aerial wires ran from the cupola to anchors on the Avenue de Suffren and Champ de Mars. These were connected to longwave transmitters in small bunkers. In 1909, a permanent underground radio centre was built near the south pillar...
Height changes
The pinnacle height of the Eiffel Tower has changed multiple times over the years as described in the chart below.
The Eiffel Tower was the world's tallest structure when completed in 1889, a distinction it retained until 1929 when the Chrysler Building in New York City was topped out. The tower also lost its standing as the world's tallest tower to the Tokyo Towerin 1958 but retains its status as the tallest freestanding (non-guyed) structure in France.
Transport
The nearest Paris Métro station is Bir-Hakeim and the nearest RER station is Champ de Mars-Tour Eiffel.The tower itself is located at the intersection of the quai Branly and the Pont d'Iéna.
Popularity
More than 300 million people have visited the tower since it was completed in 1889. In 2015, there were 6.91 million visitors. The tower is the most-visited paid monument in the world.An average of 25,000 people ascend the tower every day (which can result in long queues).
The tower and its image have been in the public domain since 1993, 70 years after Eiffel's death. In June 1990 a French court ruled that a special lighting display on the tower in 1989 to mark the tower's 100th anniversary was an "original visual creation" protected by copyright. The Court of Cassation, France's judicial court of last resort, uphel...
As one of the most famous landmarks in the world, the Eiffel Tower has been the inspiration for the creation of many replicas and similar towers. An early example is Blackpool Tower in England. The mayor of Blackpool, Sir John Bickerstaffe, was so impressed on seeing the Eiffel Tower at the 1889 exposition that he commissioned a similar tower to be...
Bibliography
1. Chanson, Hubert (2009). "Hydraulic engineering legends Listed on the Eiffel Tower". In Jerry R. Rogers (ed.). Great Rivers History: Proceedings and Invited Papers for the EWRI Congress and Great Rivers History Symposium. American Society of Civil Engineers. ISBN 978-0-7844-1032-5. 2. Frémy, Dominique (1989). Quid de la tour Eiffel. R. Laffont. ISBN 978-2-221-06488-7. 3. The Engineer: The Paris Exhibition. Vol. XLVII. London: Office for Advertisements and Publication. 3 May 1889. 4. Harriss...
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