Building Materials
Spalling hammer is used for

Driving wooden headed chisels
Rough dressing of stones
Carving of stones
Breaking small projection of stones

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Building Materials
Sapwood consists of

Innermost annular rings around the pith
Portion of timber between heartwood and cambium layer
Thin layers below the bark
Thin fibre which extends from the pith outwards and holds the annular rings together

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