Leaning Tower of Pisa - one of the most famous sights in Italy. Every year it deviates from its vertical axis by 1.2 mm.
There is a danger that in 40-50 years the tower did fall.
But it is an error in the construction of the Tower of Pisa makes it so famous and attractive for tourists.
Despite the fact that the Italian city of Pisa hasmany attractions, his fame he was mainly due to the famous leaning tower. Contrary to popular opinion, the Leaning Tower of Pisa - it is not a stand-alone facility, and the bell tower of the Cathedral of Santa Maria Assunta. And, according to the original plan, it was to stand upright and not fall.
The construction of the tower
Work on the construction of the tower began in 1173, under the direction of architect Bonanno Pisano and Wilhelm von Innsbruck. Shortly after the first floor was built, Bonanno found that the tower has deviated from the vertical axis by 4 centimeters. The works were stopped on the whole 100 years. By the time the architect was found, ready to continue the construction of the tower (as it became Giovanni di Simone), it has deviated from the vertical by 50 centimeters.
Eventually, Simon feared that the towerreally fall and after the construction of the fifth floor left work. In 1350 for the construction of the bell tower took another architect - Andrea di Tommaso. By that time, the tower leaned to have 92 centimeters. The architect decided to tilt the tower in the opposite direction, after which completed its construction, having set up the bell tower on the eighth tier (instead of the planned eleven).
It is interesting that, despite the oblique position the entire tower, the bell tower is installed completely straight. It contains seven bells tuned to the sound of seven notes.
Possible causes of falling tower
There are several reasons for the fall of the tower: too soft ground, uneven laid the foundation, tower tempted to groundwater. There is a version that the architects from the outset designed the bell tower tilted position, but it is unlikely to be reliable. Most likely, the creators of the tower understood that build on the solid foundation too, and laid in the design of the possibility of a slight slope.
Currently top of the tower is inclined fromCenter 5.3 meters and continues to deviate by 1.2 millimeters per year. The city authorities have taken various measures to stop the fall of the tower: replaced with crumbling columns, conducted underground work to strengthen the foundation. However, the tower still falls.
Scientists have calculated that, if they are not takendrastic measures, the tower actually fall within 40-50 years. And yet it is the fall of the Tower of Pisa making it one of the main attractions of Italy and attracts the attention of thousands and thousands of tourists.