thin layers below the bark innermost annular rings around the pith portion of timber between heartwood and cambium layer thin fibre which extends from the pith outwards and holds the annular rings together

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has greater impact resistance to blows than ordinary wood can be spilt in the plane of the panel cannot be bent more easily than ordinary wood of same thickness has good strength along the panel only

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annular rings heart wood medullary rays cambium layer

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kneading moulding drying pugging

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burning of bricks preparation of clay moulding of clay drying of bricks

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190 mm x 90 mm x 80 mm 190 mm x 190 mm x 90 mm 200 mm x 200 mm x 100 mm 200 mm x 100 mm x 100 mm

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5% 15% 25% 35%

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log plank batten baulk

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greater tensile strength in longer direction greater tensile strength in shorter direction same tensile strength in all directions none of the above

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lack of ventilation alternate wet and dry conditions complete submergence in water none of the above

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