On Wed, 29 Jan 2014 19:14:14 +0000, Another John
wrote:

In article ,
"Peter & Jeanne" wrote:

I do not think that John was suggesting " triangular" in section.
If my geometric memory - the shape being promoted is more rhombic.

Yes that's right: wider at the bottom than at the top, that's all. Sorry
should have made that clearer.