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It is less likely, however, that such problems would occur with the pattern of a longer period of growth, that is, anything in excess of 54 years or so.
In essence, a short period of growth, anything less than 54 rings, is not reliable, and the longer the period of time under comparison the better.
The Laboratory maintains academic links with a number of University units, is involved with public lecture programmes, and provides advice and training to other dendrochronologists.
The third principle of tree-ring dating is that, until the early- to mid-nineteenth century, builders of timber-framed houses usually obtained all the wood needed for a given structure by felling the necessary trees in a single operation from one patch of woodland, or from closely adjacent woods.