The inclination of the tower slowed down during the following centuries, it is believed that its weight was an important factor allowing a certain stabilization of the building. According to Vasari, Nicola Pisano and his son Giovanni deserve credit for this work. Tommaso Pisano continued the construction of the bell tower whose works concluded in 1372. In 1298 a plummet deviation of 1.43 m was measured and 60 years later this figure had increased to 1.63 m. Giovanni di Simone, 100 years later, resumed work trying to compensate for the inclination of the tower by vertically building four floors, however the results were not as expected, the bell tower was still leaning and the works stopped again. This period was very important and allowed the settlement of the ground, otherwise the tower would have collapsed. to the southeast, due to the unstable subsoil on which the tower was built, thus ceasing its construction. With the construction of the third floor in 1178, the tower bent 5 cm. The architect Bonanno Pisano began its construction in 1173 with the first floor which was surrounded by 15 columns in white marble with classic capitals and blind arches.
It took 3 stages and 177 years to build the Tower of Pisa.
A little of history of the Leaning Tower of Pisa
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