Dear Jackie: my eyes won't let me read that whole article. But I'm pretty sure that the
beveled wood chisel is one that has a symmetricaltrapezoidal cross section, with cutting edge
on the wide side. Most of the ones you will see in stores here are like that.
Here is what my dictionary says about "spline":
spline
n.
5< E Anglian dial., prob. akin to Norw dial. splindra, a large, flat splinter: for IE base see SPLIT6
1 a long, flat, pliable strip, as of wood or metal, esp. one used in drawing curves
2 a) a flat key or strip that fits into a groove or slot between parts b) the groove or slot into which it fits
vt.
splined, splin4ing
1 to fit with a spline
2 to cut a groove or slot in for a spline