RE: [ATM] RE: Stabilizing plate glass

["Jerry Reddell" <jerry.p.reddell63@sbcglobal.net>]

Three principles involved with thermal stabilizing the glass, conduction,
convection and radiation.

Improving radiation is hard to control and less intuitive.

The glass in water improves the conduction of heat from the mirror and very
effective...

Convection, a fan blowing air across the mirror is used to appreciably
reduce the mirror stabilizing time in the actual telescope. So it should be
another effective way of rapidly stabilizing the glass while waiting to
test.

Jerry Reddell

-----Original Message-----
From: Julio Sanchez
> Hi all, happy new year.
> I have a few plate glass blanks laying around and was thinking of making a
> set of optical flats out of them. In the past I have noticed that it takes
> up to 24 hours for the plate glass to stabilize after polishing or
figuring.
> In other words, you polish for 10 minutes and then wait 24 hours to see
what
> you have. Recently I read on this board that placing the plate glass blank
> in water makes it stabilize in about 30 minutes. Has anyone had experience
> with this or any other way of stabilizing plate glass blanks?


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