From: J-Engineering 
To: Mel Bartels 
CC: atm{at}shore.net
Reply-To: J-Engineering 


Mel,

How would you check, or better yet, quantify the smoothness of _this_
mirror using simple tests?
--
Ray

Mel Bartels wrote:

> >>>
> and offer comment as to whether I need to get closer to a
> sphere before starting to parabolise, I would be most
> grateful!
> <<<
>
> Don't worry about sphericity, do worry about smoothness.  If your figure is
> relatively smooth, then you can start introducing parabolization into the
> figuring.  I'd say you are ready for a shot at it.
>
> Mel Bartels

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