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Bowing. Twisting. Cupping. Crooking
TYPES OF WARPING
Hard Wood. Soft Wood
CLASSIFICATION OF EXOGENOUS TREES
Natural Growth of the tree. Wood Diseases. Animal Parasite. Faulty Processing. Too Rapid Seasoning
CAUSES OF DEFECTS IN LUMBER
Exogenous Trees. Endogenous Trees
CLASSES OF TREES
Changes in moisture content will produce dimensional changes in the timber. Higher moisture content diminishes the strength of the wood. Presence of harmful fungi on freshly cut wood.
EFFECTS OF MOISTURE IN WOODS