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

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.

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

iii)    Formation of a curvature along the length

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