Google is great. Okay, I'm wrong. I'm in good company though. Galileo
also though that a catenary was a parabola.

Hyperbola is done with 3 pins, not two.

http://jwilson.coe.uga.edu/EMT668/EMT668.Folders.F97/Waggener/Units/
Conic%20Sections/Conic%20Plans/demoideas.htm

On Wednesday, January 29, 2003, at 03:39  PM, David Brodbeck wrote:

> That'd be a caternary curve.  I don't know if they're hyperbolics or
> not.
> I'm pretty sure there's a way to do it that involves the string being
> tight.  I know you can do an ellipse that way, but I can't remember the
> details.  Involves two pins and a loop of string, I think.