Al Gietzen wrote:

Paul;

Attached is a set of coordinates for an ideal diffuser from Kuchemann &
Weber.  Kuchemann-duct-Coord.gif

Could you enlighten me as to the symbology used in this chart so I can
interrpret.

Thanks much,
Al

This should do it for you Al. It is a simple 2D curve. When you get
into 3D things are a little more complicated I would guess. 

Paul Lamar
 
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