Re: Rayleigh Water Test (Was: Re: [ATM] 30" Flats)

[Mike Lockwood <melockwo@uiuc.edu>]

Hi,

vorblesnak@peak.org wrote:
> I think Jerry makes a valid point here.  It would seem you would want to
> oversize the basin to avoid edge distorion.  Say 25 to 30 percent bigger
> than the mirror anyway.

For water, a pan that is 2" larger in radius is enough to avoid edge 
distortion, in my experience.

I'm using a 14.5" pan for testing a 10" flat.  A pan that is much 
larger than that requires lots more water to fill, and vibrations take 
longer to damp out.

	Mike Lockwood

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