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This was caused by the particular morphological characteristics of the ground underneath, composed of various strata formed of deposits and clayish material, interlayered, at about a metre of depth, by strata of subterranean waters. This conclusion has been reached by observing the composition of the ground and the corrections made to each floor of the Tower. Given the sporadic documentary evidence which we possess, it would appear certain that the oscillation of the building over the centuries was minimal, it having probably settled into a certain equilibrium with the subsoil. This is confirmed by the accurate survey undertaken in 1817 by two English scholars, Cresy and Taylor.
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Western Europe
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