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

[vorblesnak@peak.org]

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.

David Davis
Toledo, OR

> I would think that the cohesive forces in a liquid could cause a distortion
> in the surface. (Foe example a drop of water on most surfaces is usually
not
> spread flat but is a ellipsoid configuration or thereabouts. Also depending
> on the container walls the liquid can actually be pulled up or pushed down
> near the wall. Wouldn't this mean that great care is needed to get
> compatible type of container, type of liquid, the percentage of useful flat
> surface declines.   etc..  I believe this led to having to spin mecury in
> order to get a reasonable flat surface.

> Jerry Reddell

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