Located Tower of Pisa in Italy, the city of Pisa in the state of Tuscany, construction started in 1175 AD, and lasted for building 174 in, known as the Leaning Tower of Pisa to the presence of Milan by the deviation from the vertical plane, consisting of eight floors, built of white marble Roman-style, up 54.5 meters the view of a staircase built inside the walls consisting of 300 degrees, (currently equipped with an electric elevator), and the Tower of Pisa is one of the wonders of the world.
Tendency is clearly visible with a about 18 feet (the tendency for more than five degrees), and said that the reason for this inclination is slack, and the decline in the soil it is built tower. The back of this inclination since the early stages of building this tower, but the architects have continued to build on the basis of the same inclination, and in 1275 AD when they were building a combined fourth and fifth of the tower tried to architects moved the center of the tower to avoid the inclination, but seems they did not succeed so, and yet are attempts to stop the inclination and by establishing the pillars of dolly.
Since 1990 in the last century the tower was closed to prevent tourists from climbing because it may collapse at any moment.
Tower of Pisa was associated with the world famous Italian Galileo Galilei Galileo and his experience in the acceleration of Earth.
Height of the tower is 55 meters above the ground. The estimated mass to 14,500 tons. The current tendency is estimated at 5.5 degrees, and the tower 294 degrees.
Construction of the tower in August 9, 1173 AD. After the construction of the third floor in 1178, money the tower and construction work was stopped for a century. In 1272, the construction of four additional floors to amend the inclination angle. Realization and stopped again in 1301. And in 1372 built another floor and put the bell in the tower.
There is disagreement about the identity of the architect, who built the Leaning Tower of Pisa. For years, the Bonanno Pisanu is built by the architect, an artist known from the twelfth century of Pisa, famous bronze with his works, especially in the Cathedral of Pisa. Construction of the tower which was started in 1174 by Bonanno Pizano, was completed after a long pause at the hands of Giovanni Pisanu was in the second half of the fourteenth century by Tommaso di Andrea Pisanu.
The story goes that Galileo Galilei dropped balls (cannon) women with different masses of the tower to demonstrate that the speed of their fall does not depend on Ktlhma. This story, although it is on the tongue of a pupil of Galileo, is largely false.
Benito Mussolini ordered the tower to be vertical position, Vtm poured cement foundations. The result was unexpected and made the tower dive more in the soil.
During World War II, U.S. military destroyed all the towers at Pisa about fear of the possibility of snipers in the towers. The bombing of the tower of Pisa is also planned; but the decision came at the last minute to pull out the tower was saved from destruction.
On February 27, 1964, requested the Italian government aid to prevent the tower from falling. Was appointed a multilateral group of engineers, mathematicians, historians, and they met in the Azores islands to discuss how to install it. After several decades of research and work on the subject, the tower was closed to visitors in January 1990. After a decade of efforts to patch and the installation was re-opened the doors to visitors in December 15, 2001. Been proposed several ways to install the tower including the addition of 800 metric tons of lead counterweights to the party or high from the base of the tower. The ultimate solution to correct the inclination was to remove 38 cubic meters of soil from under the party of high Hadpalberg. The tower was declared a "stable" for three hundred years later, at least.
At least two people jumped from the tower using a parachute (parachute) are Mike McCarthy in the August 5, 1988 and (Boston Globe in August 6, 1988), Arne Arthus in the February 1, 2000
In order to maintain the tower had been built several pillars and scaffolding on the exterior as a precautionary measure to temporarily prevent it from falling.
Trying a large number of the worlds most famous architects in solving the problem of the tower which is one of the most difficult engineering problems to maintain the form of Leaning Tower.
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