Quote - What about the image and link which lesbentley posted, above?  From the image, is Zark applying the catenary correcly, in this case where the chain endpoints are at different heights?  It looks like that's just taken the y = cosh(x) curve and stopped before reaching the top of the curve.  That seems like a feasible approach, but is it accurate?

Hanging a bit of cord in front of my monitor, the curve of the Zark chain looks quite close. Now If someone has a fine neck chain they could hang in front of their monitor it would hang more accurately than my cord, which is a bit stiff, and we could know if the Zark curve is correct or not. It certainly looks right to my eye.