The design of a tree is a living record, like the human face, showing the signs of life. Since it is difficult to find two exactly identical fates, one can hardly expect to find two completely identical tree designs. It is unreasonable, therefore, to judge and evaluate trees by stereotype criteria. Judging trees is a difficult task which certainly needs some practice. It is not easy, for example, to determine the actually load-carrying parts, i.e. the recently added parts of a tree. Non-carrying parts may still exist because, as mentioned above, trees do not shrink like bones. However, they do reveal earlier load situations, i.e. the mechanical history of the tree. The following examples will enable the reader to increase his awareness of individual details with a good eye for the essentials. All examples, taken from nature, are self-explanatory with detailed descriptions added to each.
KeywordsTree Ring Contact Stress Growth Stress Wind Load Compression Wood
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