Re: [ATM] RE: ATM Digest, Vol 12, Issue 17

["Bill Kelley" <flex@commspeed.net>]

>
> David,
> You can tell if glass is completely polished by shining a small light (a 
> pen
> light will do) at an angle, onto the surface. The angle should be less 
> than
> 10 degrees. If you can see a reflection of the light on the glass surface,
> no matter how faint, the glass is not completely polished. You can move 
> the
> light from the center to the edge of the glass since glass disks polishes
> first at the center. Try it with a piece of regular window glass and with
> one that is fine ground so you can see the difference.

David, Julio, et al,

He means if the surface is illuminated by low incident light. There will be 
reflection and scattering at low incidence at any degree of polish. Less 
scattering as the polish improves. I have already explained this to you.
David- quit trying to avoid the work of completely polishing your mirror, 
and take my advice to set the 20" X 3/4" aside for now,  and take my offer 
of free materials, and make a small mirror,  Do your apprenticeship. Right 
now you don't have a clue, and I'm trying to help you make some real 
progress and learn to make telescope mirrors. You are just taking up band 
width and peoples time asking these repetitive questions. I telephone David 
and go over these things in detail. and I feel like I am wasting my time if 
the same stuff pops up on the ATM site.

Will some of you guys tell David to take my generous offer, and learn 
something about what he is trying to do?

Bill 


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