When three years of grinding (done slowly to avoid distortion caused by frictional heat) and cleaning with blasts of electrons have produced a concave paraboloid surface true to .
He also flattened the outer curves of the lenses from spherical to paraboloid shapes.
Now the big glass disc, yellowish blue and slightly murky like an old Pyrex dish, is a paraboloid perfect within two millionths of an inch.
Comment on Doors Open Denver invites the city behind closed doors Ray, the hyperbolic paraboloid at Zeckendorf Plaza was just part of the May D&F department store. Most of the retail space was actually in the box-like structure behind it, which was clad in gold-metal panels. The building is still there--it's part of the Sheraton--but it's now covered in glass.
April 11, 2014 - Denver Post
Flip Saunders in Chicago Tribune It's called the hyperbolic, paraboloid, transitional, floating zone defense,Pistons coach Flip Saunders explained after practice Tuesday.