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

[Mike Lockwood <melockwo@uiuc.edu>]

Matt,

matt wrote:
> -----Original Message-----
> From: Mike Lockwood <melockwo@uiuc.edu>
> To: ATMList <atm@atmlist.net>
> Date: Thursday, February 17, 2005 12:30 PM
> Subject: Re: Rayleigh Water Test (Was: Re: [ATM] 30" Flats)
> I was mostly interested if the test was performed on a finished and
> functional telescope, with an already coated mirror, and the viscous liquid
> had a very reflective surface, no transparency, and layer thickness would be
> adjusted just to get maximum flatness ( not for transmissivity to match
> uncoated glass) . You know, a simple double pass autocollimation
> interferometric test with a small interferometer in the eyepiece holder, the
> scope pointing  at the "flat" , and nothing else . Cheap, but would it work,
> that's the million dollar question. I might have to try.

I guess I think of the water (or other liquid) test being used to make 
larger glass flats that can then be used to autocollimate entire 
telescopes without having to suspend them upside down.

I also wanted to share a few of my recent experiences with the water 
test.  Sorry if I got too far off the topic you intended.

	Mike Lockwood

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