From: "Dwight K. Elvey" 
To: atm{at}shore.net
Reply-To: "Dwight K. Elvey" 


Hi Martial
 One thing to consider is that the center of the secondary
is not on the axis of HYPERBOLOID. In fact, it is quite far from the axis
of the correct HYPERBOLOID shape. You need to consisder this when comparing
to a spherical shape. the minor and major axis would be quite different in
curvature for a large axis offset.
Dwight


>From: MLThiebaux 
---snip----
>
>2. The slightly spherical diagonal should be compared to the nearest
HYPERBOLOID, not to the perfect plane.  The required hyperboloid has two
principal curvatures differing by a factor of 2, say k and 2k.  One minimax
solution (hard to explain without a picture) for fitting such a hyperboloid
to the sphere is found to have the following properties:
>
>
>Martial Thiebaux
>Rawdon Hills, Nova Scotia

--- BBBS/NT v4.00 MP