The tower stands 320 metres (1,050 ft) tall, about the same height as an 81-story building. During its construction, the Eiffel Tower surpassed the Washington Monument to assume the title of the tallest man-made structure in the world, a title it held for 41 years, until the Chrysler Building in New York City was built in 1930. However, because of the addition, in 1957, of the antenna atop the Eiffel Tower, it is now taller than the Chrysler Building. Not including broadcast antennas, it is the second-tallest structure in France, after the Millau Viaduct.
The tower has three levels for visitors. Tickets can be purchased to ascend, by stairs or lift, to the first and second levels. The walk from ground level to the first level is over 300 steps, as is the walk from the first to the second level. The third and highest level is accessible only by elevator. Both the first and second levels feature restaurants.
The tower has become the most prominent symbol of both Paris and France, often in the establishing shot of films set in the city.
Design of the tower
Material
Wind considerations
At the time the tower was built many people were shocked by its daring shape. Eiffel was criticised for the design and accused of trying to create something artistic, or inartistic according to the viewer, without regard to engineering. Eiffel and his engineers, however, as 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 certain it would withstand the wind. In an interview reported in the newspaper Le Temps, Eiffel said:Researchers have found that Eiffel used empirical and graphical methods accounting for the effects of wind rather than a specific mathematical formula. Careful examination of the tower shows a basically exponential shape; actually two different exponentials, the lower section overdesigned to ensure resistance to wind forces. Several mathematical explanations have been proposed over the years for the success of the design; the most recent is described as a nonlinear integral equation based on counterbalancing the wind pressure on any point on the tower with the tension between the construction elements at that point. As a demonstration of the tower's effectiveness in wind resistance, it sways only 6–7 cm (2–3 in) in the wind.Now to what phenomenon did I give primary concern in designing the Tower? It was wind resistance. Well then! I hold that the curvature of the monument's four outer edges, which is as mathematical calculation dictated it should be […] will give a great impression of strength and beauty, for it will reveal to the eyes of the observer the boldness of the design as a whole.
Accommodation
When built, the first level contained two restaurants: an "Anglo-American Bar", and a 250 seat theatre. A 2.6 m (8 ft 6 in) promenade ran around the outside.On the second level, the French newspaper Le Figaro had an office and a printing press, where a special souvenir edition, Le Figaro de la Tour, was produced. There was also a pâtisserie.
On the third level were laboratories for various experiments and a small apartment reserved for Gustave Eiffel to entertain guests. This is now open to the public, complete with period decorations and lifelike models of Gustave and some guests.
Engraved names
Gustave Eiffel engraved on the tower seventy-two names of French scientists, engineers and other notable people. This engraving was painted over at the beginning of the twentieth century but restored in 1986–1987 by the Société Nouvelle d'exploitation de la Tour Eiffel, a company contracted to operate business related to the Tower.Maintenance
Maintenance of the tower includes applying 50 to 60 tonnes of paint every seven years to protect it from rust. The height of the Eiffel Tower varies by 15 cm due to temperature.Aesthetic considerations
In order to enhance the impression of height, three separate colours of paint are used on the tower, with the darkest on the bottom and the lightest at the top. On occasion the colour of the paint is changed; the tower is currently painted a shade of bronze. On the first floor there are interactive consoles hosting a poll for the colour to use for a future session of painting.The only non-structural elements are the four decorative grillwork arches, added in Stephen Sauvestre's sketches, which served to reassure visitors that the structure was safe, and to frame views of other nearby architecture.
One of the great Hollywood movie clichés is that the view from a Parisian window always includes the tower. In reality, since zoning restrictions limit the height of most buildings in Paris to 7 stories, only a very few of the taller buildings have a clear view of the tower.
Tourism
Popularity
More than 200,000,000 people have visited the tower since its construction in 1889, including 6,719,200 in 2006. The tower is the most-visited paid monument in the world.Passenger elevators
Ground to the second level
The original elevators to the first and second floors were provided by two companies. Both companies had to overcome many technical obstacles as neither company (or indeed any company) had experience with installing elevators climbing to such heights with large loads. The slanting tracks with changing angles further complicated the problems. The East and West elevators were supplied by the French company Roux Combaluzier Lepape, using hydraulically powered chains and rollers. The North and South elevators were provided by the American company Otis using car designs similar to the original installation but using an improved hydraulic and cable scheme. The French elevators had a very poor performance and were replaced with the current installations in 1897 (West Pillar) and 1899 (East Pillar) by Fives-Lille using an improved hydraulic and rope scheme. Both of the original installations operated broadly on the principle of the Fives-Lille lifts.The Fives-Lille elevators from ground level to the first and second levels are operated by cables and pulleys driven by massive water-powered pistons. The hydraulic scheme was somewhat unusual for the time in that it included three large counterweights of 200 tonnes each sitting on top of hydraulic rams which doubled up as accumulators for the water. As the elevators ascend the inclined arc of the pillars, the angle of ascent changes. The two elevator cabs are kept more or less level and indeed are level at the landings. The cab floors do take on a slight angle at times between landings.
This arrangement means that the elevator carriage, complete with its cars and passengers, travels 8 times the distance that the rams move the chariot, the 128 metres from the ground to the second floor. The force exerted by the rams also has to be 8 times the total weight of the lift carriage, cars and passengers, plus extra to account for various losses such as friction. The hydraulic fluid was water, normally stored in three accumulators, complete with counterbalance weights. To make the elevator ascend, water was pumped using an electrically driven pump from the accumulators to the two rams. Since the counterbalance weights provided much of the pressure required, the pump only had to provide the extra effort. For the descent, it was only necessary to allow the water to flow back to the accumulators using a control valve. The lifts were operated by an operator perched precariously underneath the lift cars. His position (with a dummy operator) can still be seen on the lifts today.
The Fives-Lille elevators were completely upgraded in 1986 to meet modern safety requirements and to make the elevators easier to operate. A new computer-controlled system was installed which completely automated the operation. One of the three counterbalances was taken out of use, and the cars were replaced with a more modern and lighter structure. Most importantly, the main driving force was removed from the original water pump such that the water hydraulic system provided only a counterbalancing function. The main driving force was transferred to a 320 kW electrically driven oil hydraulic pump which drives a pair of hydraulic motors on the chariot itself, thus providing the motive power. The new lift cars complete with their carriage and a full 92 passenger load weigh 22 tonnes.
Owing to elasticity in the ropes and the time taken to get the cars level with the landings, each elevator 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 floor. The average journey time between floors is just 1 minute.
The original Otis elevators in the North and South pillars in their turn proved to be inferior to the new (in 1899) French elevators and were scrapped from the South pillar in 1900 and from the North pillar in 1913 after failed attempts to repower them with an electric motor. The North and South pillars were to remain without elevators until 1965 when increasing visitor numbers persuaded the operators to install a relatively standard and modern cable hoisted system in the north pillar using a cable-hauled counterbalance weight, but hoisted by a block and tackle system to reduce its travel to one third of the elevator travel. The counterbalance is clearly visible within the structure of the North pillar. This latter elevator was upgraded in 1995 with new cars and computer controls.
The South pillar acquired a completely new fairly standard electrically driven elevator in 1983 to serve the Jules Verne restaurant. This was also supplied by Otis. A further four-ton service elevator was added to the South pillar in 1989 by Otis to relieve the main elevators when moving relatively small loads or even just maintenance personnel.
The East and West hydraulic (water) elevator works are on display and, at least in theory, are open to the public in a small museum located in base of the East and West tower, which is somewhat hidden from public view. Because the massive mechanism requires frequent lubrication and attention, public access is often restricted. However, when open, the wait times are much less than the other, more popular, attractions. The rope mechanism of the North tower is visible to visitors as they exit from the elevator .
Second to the third level
One interesting feature of the original installation was that the hoisting rope ran through guides to retain it on windy days to prevent it flapping and becoming damaged. The guides were mechanically moved out of the way of the ascending car by the movement of the car itself. In spite of some antifreeze being added to the water that operated this system, it nevertheless had to close to the public from November to March each year.
The original elevators complete with their hydraulic mechanism were completely scrapped in 1982 after 97 years of service. They were replaced with two pairs of relatively standard rope hoisted cars which were able to operate all the year round. The cars operate in pairs with one providing the counterbalance for the other. Neither car can move unless both sets of doors are closed and both operators have given a start command. The commands from the cars to the hoisting mechanism are by radio obviating the necessity of a control cable. The replacement installation also has the advantage that the ascent can be made without changing cars and has reduced the ascent time from 8 minutes (including change) to 1 minute and 40 seconds. This installation also has guides for the hoisting ropes but they are electrically operated. The guide once it has moved out of the way as the car ascends automatically reverses when the car has passed to prevent the mechanism becoming snagged on the car on the downward journey in the event it has failed to completely clear the car. Unfortunately these elevators do not have the capacity to move as many people as the three public lower elevators and long lines to ascend to the third level are common. Most of the intermediate level structure present on the tower today was installed when the elevators were replaced and allows maintenance workers to take the elevator halfway.
The replacement of these elevators allowed the restructuring of the criss-cross beams in upper part of the tower and further allowed the installation of two emergency staircases. These replaced the dangerous winding stairs that were installed when the tower was constructed.
Restaurants
The tower has two restaurants: Le 58 tour Eiffel, on the first floor 311 ft (95 m) above sea level; and the Le Jules Verne, a gastronomical restaurant on the second floor, with a private lift. This restaurant has one star in the Michelin Red Guide. In January 2007, the multi-Michelin star chef Alain Ducasse was brought in to run Jules Verne.Attempted relocation
According to interviews given in the early 1980s, Montreal Mayor Jean Drapeau negotiated a secret agreement with French President Charles de Gaulle for the tower to be dismantled and temporarily relocated to Montreal to serve as a landmark and tourist attraction during Expo 67. The plan was allegedly vetoed by the company which operated the tower out of fear that the French government could refuse permission for the tower to be restored to its original location.Economics
The American TV show Pricing the Priceless speculates that in 2011 the tower would cost about $480,000,000 to build, that the land under the tower is worth $350,000,000, and that the scrap value of the tower is worth $3,500,000. The TV show estimates the tower makes a profit of about $29,000,000 per year, though it is unlikely that the Eiffel Tower is managed so as to maximize profit.It costs $5,300,000 to repaint the tower, which is done once every seven years. The electric bill is $400,000 per year for 7.5 million kilowatt-hours.
The Tokyo Tower in Japan is a very similar structure of very similar size. It was finished in 1958 at a final cost of ¥2.8 billion ($8.4 million in 1958).
Reproductions
Main article: List of Eiffel Tower replicas
As one of the most iconic images in the world, the Eiffel Tower has
been the inspiration for the creation of over 30 duplicates and similar
towers around the world.
