Subject: Re: ATM bulls eye on faucault test

[Bob Goff <goffaxe@azstarnet.com>]

This bullseye feature is as much a feature of inappropriate polishing
technique as it is poor materials used in the last few steps including both
grinding and polishing.
The 'Scripture according to Texereau  most certainly wasnt read by the Guy
who helped me so much become a Master Optician, Franz Liebert, of Zeiss. I
don't believe that the managment of Zeiss let such a primitive manual be
read there. Believe it or not, Tex is not the be all and end all of this tm
stuff.

Bob


At 09:50 AM 08/31/2001 -0700, you wrote:
>   Mr. Foreman (?),     Scripture  (Texereau), Chapter 2, section 19,
>titled "The completion of  Polishing":   "We have avoided discussing
>testing and retouching  earlier because it is unwise for the novice to test
>a mirror before it is  completely polished. If he should observe
>prematurely that the surface form is  good, he will not dare continue
>polishing and may remain content with a very  "gray" mirror. Or if he sees
>a defect, he may attempt retouching, usually with  unfortunate results, and
>follow this with attempts even more disastrous. From  that moment, he is
>LOST."        cheap laserprinted grating over the light source of your 
>Focault tester in place of the KE, and it's much more intuitive to
>interpret  what you're seeing in the early stages of figuring. Good luck.  
>Later, Herb.     
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