From: "Jeff Baldwin" 
To: "Steve Fejes" ,
        
Reply-To: "Jeff Baldwin" 


In a dark room with the mirror extremely well cleaned, a hand laser works
well for finding pits.  If the spot shows on the mirror's surface, the
light is scattering rather than transmitting through or reflecting off. 
The edge is the usual slow poke, don't finish the polishing stage until the
edge is good.
JB

Jeff Baldwin
Stockton  CA
W121d20.96m N38d01.62m
bald{at}gotnet.net
http://bald.gotnet.net/
>
> I want to determine the surface quality of a telescope mirror to know
> when it is polished enough to start figuring.
>
> Thanks,  Steve
>
>

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