50 MPa
100 MPa
150 MPa
200 MPa
1.5 to 2.0
2.0 to 2.5
2.5 to 3.0
3.0 to 3.5
driving wooden headed chisels
rough dressing of stones
carving of stones
breaking small projection of stones
cutting soft stones
cutting hard stones
cutting large blocks of stones
dressing stones
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