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Summary Two impact devices for the detection of the internal decay of trees—the Resistograph M300 and the Resistograph M500 which provide a drilling profile print-out for use in trees and construction timber to a maximum depth of 500 mm are described. Twenty figures demonstrate the results provided by the Resistograph in the detection of decay, wet wood cracks and tension wood.
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Mattheck et al. (1997) studied this question.
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