Chisels of bronze began of very small size (33) at S.D.
For this purpose a horizontal bar Shaft armed with vertical cutting chisels is used, which cuts boring.
The engraver, who is very rarely the designer, then cuts the otitlines into the block with a knife, afterwards removing the superfluous wood with gouges and chisels.
Using the hammer only, some of them can beat out an intricate shape as truly and delicately as a sculptor could carve it with his chisels.
The use of harpoons and small chisels of copper next arose, then broad flaying knives, needles and adzes, lastly the axe when the metal was commoner.