Tower of Pisa Leaning

 

Tower of Pisa Leaning

The lean of the leaning tower of tower of Pisa is because of the weak foundation and unstable subsoil. The site of the tower was a large river delta in the past. The architects and builders of the tower were however unaware of this fact. They did not know that the soil was a mixture of sand, clay and water, which was unsuitable for large buildings. The lean was noticed for the first time during the construction of the third floor in A.D. 1178. During the construction of the next three floors, the architects tried to adjust the lean. This gave the tower a slight banana shape and the tower began leaning towards south in A.D. 1272. Architects tried to correct the north side and six steps on the south side at the bell tower. This however, gave the tower a slight S-shape. Today, gave the tower leans about 5.5 degree towards south.