From: "Russell Jocoy" 
To: bader{at}hydroblendinc.com, atm-digest{at}shore.net
Reply-To: "Russell Jocoy" 


>From: Byron Ader 
>Reply-To: Byron Ader 
>To: atm-digest{at}shore.net
>Subject: ATM Done Polishing (I believe) now Foucault
>Date: Mon, 7 Jul 2003 09:24:49 -0600
>
>
>I have completed polishing my mirror I believe, As near far as I can tell I
>have it pretty good.  I can hold the mirror up to a light and maybe see (at
>certain angles) a very faint hint of "smoked" glass.  I can
shine a laser
>through it and it seems to be fairly constant. I have seen no real
>improvement over the surface from the last two hours.
>
>I tried out my Foucault test for the first time over the weekend. I need to
>modify my tester so that it works better but it did return some results.  I
>have a constant "donut" in the middle of my mirror.  I have a
6 inch mirror
>and can best describe the location of this "donut" as
starting 1 1/2" from
>the edge of the mirror and forming a complete circle all around my mirror
>at
>this distance.. The mirror indicates the type of shadowing that would
>reflect the spherical surface except for the donut (which is illuminated).
>Inside the donut is more shadowing that probably is is consistent with the
>mirror's spherical shape.
>
>I hope I have described this well. Has anyone seen this phenomenon before
>and what have you done about it?  I have to spend more time with the
>Foucault test to make sure I understand what it is telling me.
>
>
>TIA,
>Byron
>

("atm{at}shore.net")

    Byron,
         Set up a RONCHI screen rig, I do believe it will tell you alot more
at this point of your progress
                                        R.L.J.
("atm{at}shore.net")

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