SonomaProducts.com (in
) said:

| Let's see... it's been a long time and I always do it with CAD now.
| You are esentially slicing through a cylinder at an angle. That is
| an elipse if memory serves. It's a parabol if you slice through a
| cone.

It may be a helix - in which case the radius remains constant and the
height changes at a constant rate as the angle increases/decreases.
--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/solar.html