Link to patterns - traditional Celtic knot instructions

Pam Pincha-Wagener has posted 3 pages of instructions showing the traditional method of drawing celtic knots.  These instructions will allow you to be more precise, but does require creating a grid.  I'm very glad that Pam has posted these.  I think for many of you, this method will be more intuitive.

Page 1,
Page 2,
Page 3.