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The Tower is the bell tower of the Cathedral. Its construction began in the second half of the XII century.
Characteristics of the Tower
- The height of the building from the foundations to the belfry is c. 60m- The ring shaped foundation has an external diameter of 19.6m- The Tower weighs c. 14,500 tonnes- The Tower is shaped like a hollow cylinder formed by two concentric walls (in marble blocks) which contain mortar and other matter- A spiral stair within the cylindrical body allows access to the arcaded storeys and to the summit of the tower- The thickness of the wall at the first level is 4.1m. At higher levels it is 2.7m - The inclination is c. 5½ degrees towards the south; this means that the seventh cornice protrudes about 4.5m over the first cornice.
Construction history
The Tower was constructed in the course of about 200 years- The history of the building works is only partially documented, and has been reconstructed on the basis of indirect sources- Work on the foundation began on 9 August 1173.- The third order had only just been completed when, in c. 1178, the building works were suspended.- Around 1272 the construction was recommenced, only to be interupted again, at the level of the 7th cornice, in c. 1278.- The construction of the belfry (8th order) began around 1360 and was completed c. 10 years later.- The Tower has subsided vertically by c. 2.8m as a result of the unstable nature of the underlying ground. The catino at the base was excavated in 1838 to bring to light the bases of the columns which had sunk underground.- The differential subsidence is 1.89m; this means that the extreme north and south have subsided by 1.86m and 3.75m respectively.
The Tower is the bell tower of the Cathedral. Its construction began in the second half of the XII century.Characteristics of the Tower
- The height of the building from the foundations to the belfry is c. 60m- The ring shaped foundation has an external diameter of 19.6m- The Tower weighs c. 14,500 tonnes- The Tower is shaped like a hollow cylinder formed by two concentric walls (in marble blocks) which contain mortar and other matter- A spiral stair within the cylindrical body allows access to the arcaded storeys and to the summit of the tower- The thickness of the wall at the first level is 4.1m. At higher levels it is 2.7m - The inclination is c. 5½ degrees towards the south; this means that the seventh cornice protrudes about 4.5m over the first cornice.
Construction history
The Tower was constructed in the course of about 200 years- The history of the building works is only partially documented, and has been reconstructed on the basis of indirect sources- Work on the foundation began on 9 August 1173.- The third order had only just been completed when, in c. 1178, the building works were suspended.- Around 1272 the construction was recommenced, only to be interupted again, at the level of the 7th cornice, in c. 1278.- The construction of the belfry (8th order) began around 1360 and was completed c. 10 years later.- The Tower has subsided vertically by c. 2.8m as a result of the unstable nature of the underlying ground. The catino at the base was excavated in 1838 to bring to light the bases of the columns which had sunk underground.- The differential subsidence is 1.89m; this means that the extreme north and south have subsided by 1.86m and 3.75m respectively.
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