A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Hanno Ix
Date: 2015 Feb 27, 16:02 -0800
A triangular pyramid is a pyramid having a triangular base.
The tetrahedron is a triangular pyramid having congruent
equilateral triangles for each of its faces.
I find Mr. Breed's method fascinating. I did indeed draw a copy of the diagram, cut it out and folded it into a perfect little tetrahedron. Neat. Thank you for posting this. If I ever run across a copy of that book, I'm buying it.