With aid of sketch, describe each of the following timber defects

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With aid of sketch, describe each of the following timber defects.

  1. Cupping
  2. Twisting
  3. Spring

i)    Cupping is the formation of curvature across the face of the board.

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ii)    Twisting is the spiral formation of the board along its length

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iii)    Formation of a curvature along the length

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