The Pisa Tower of Pisa in Italy in Tuscany in the state, construction started in 1175 AD, and a built in 174, known as the Leaning Tower of Pisa to Milan, and the presence of a deviation from the vertical level, consisting of eight floors built of white marble Roman-style meters, up 54.5 with practice based within the walls consisting of 300 degrees, (Bmassad is currently equipped with electric), and the Tower of Pisa is one of the wonders of the world.
Tendency is evident at about 18 feet (the tendency for more than five degrees), and said that the reason for this inclination is the softness and the decline in soil based upon the tower. Milan this afternoon from 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 tower of the architects tried to move the center of gravity of the tower to avoid the inclination, but apparently they were not successful, and yet being attempts to stop the inclination and the pillars that supported the administration.
Since 1990 in the last century the tower was closed and to prevent tourists from climbing to show that the collapse at any moment.
Tower of Pisa has been associated with the world famous Italian Galilee Galileo Galili and experience in the acceleration of the ground.
High tower is 55 meters from the surface of the Earth. B The estimated mass of 14.500 tons. The current tendency is estimated at 5.5 degrees, and the tower 294 degrees. The establishment of the tower began in August 9, 1173 AD. After building the third floor in 1178, capital of the tower and stopped the construction work of the century. In 1272, the four-storey building in order to amend the additional angle of inclination. And stopped again in the 1301. In 1372 another floor was built and a bell in the tower.
There was a disagreement about the identity of the architect who built the Leaning Tower of Pisa. For years the Bonano Pizano is built by the architect, an artist known twelfth century of Pisa, famous bronze with his works, particularly in the Pisa Cathedral. Building the tower, which was launched in 1174 by Bonano Pizano, and was completed after a long hiatus by Giovanni Pisanu was in the second half of the fourteenth century by Tommaso di Andrea Pisanu.
Told that Galileo Galili dropped twice (gun shells) with different blocks of the tower to make it clear that the speed of fall does not depend on Ktlhma. This story, although it is for the students of San Galileo, is the wrong scale.
Benito Mussolini ordered that the tower will be put to the horizontal, has been pouring cement foundations. The result was unexpected and made the dive over the tower in the soil.
During the Second World War, the U.S. military destroyed all the towers in Pisa about, for fear of the possibility of snipers in the towers. The bombing of the Pisa Tower is also planned; but the decision came at the last moment to withdraw the tower was saved from destruction.
In February 27, 1964, the Italian Government requested assistance to prevent the tower from falling. Was the appointment of a multilateral group of engineers, and historians Riyaziatien and 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 correction and stabilization efforts have been re-opened the doors to visitors in December 15, 2001. Been proposed several ways to stabilize the tower, including the addition of 800 metric tons of lead as an exchange for the party or from a high tower. The ultimate solution to correct the inclination was the removal of 38 cubic meters of soil from under the base of the party high tower. The tower was declared "stable" to Thelatmip at least another year. 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 February 1, 2000
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