> > I remember hearing that
> they were used by lumberjacks because they could be sharpened and
> shaped for two different kinds of cutting. Issat so?
It is so. One bit is honed very sharp for felling and limbing. The other is
sharpened at the same angle (25 degrees) but is rounded a bit to use at
ground level and to cut through knots. In the field if you used your well
sharpened bit to cut through a knot, you'd dull it in a few strokes. The
purpose of
the second bit is to save the edge of the first. </HTML>