but very little helps,”said Prof.
John Burland, the only British member of the rescue committee.
“The tower is still very slightly moving towards being upright.
”which has been leaning almost since building work first began in 1173, was closed to the public in 1990 because of safety fears.
The 183foot tower was nearly 15 feet off vertical and its structure was found to have been weakened by centuries of strain(作用力).
urland said it could have collapsed “at any moment”.
However, it took nine years of quarrelling before any work was done.
The last attempt at straightening the tower was carried out.
Concrete(混凝土) was poured into the foundations, but the result was that the tower sank further into the soil.
The straightening work involved digging out around 70 tonnes of earth from the northern side of the tower, causing it to sink on that side.
Before the digging started, the tower was fixed with steel ropes and 600 tonnes of lead weights.
However, halfway through the project, concerns at the ugliness of the weights led to their removal and the tower leaned greatly.
The weights were hurriedly reattached. One night, the tower moved more than it had averaged in an entire year.
The tower's stonework has also been restored.
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