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- the direction of the fibres which make up the wood in relation to the trunk.
In straight grained wood the elements lie parallel to each other and to the trunk, as a result of which the wood is easliy split. It is usual to work timber with the grain, ie plane or adze the timber so that the grain slopes away from the direction in which the tool is pushed. Working against the grain can cause the tool to jam and damage the surface of the timber.