From: "Dwight K. Elvey" 
To: atm{at}shore.net
Reply-To: "Dwight K. Elvey" 


>From: "Bob May" 
>
>The glass surface should have a smooth frosty appearance.  In the eyeloupe,
>you will probably see the purple and blue speckles amongst the other
>speckles and they should be nicely spread about.  I tend to use a distant
>light source and reflect the angle of the light until it turns an orange
>color and then traverse it across the surface to see the amount of
>reflection of the surface.  Changes in color will indicate the fineness of
>the grind with oranger being coarser.
>Bob May
>http://nav.to/bobmay
>bobmay{at}nethere.com
>NEW! http://bobmay.astronomy.net


Hi
 I prefer this to the Sharpie test. This angle of reflection is
something like a really bad diffraction grating. Dwight

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