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Re: [ATM] Spherometers and sphericity

Mike Lockwood wrote:

> The pencil test is another option.  Put lines on the mirror with a 
> pencil, then gently rub it against the tool WITHOUT any abrasive.  

Yow.  Scary.  I have these visions of a single particle of grit 
getting in there and gouging a furrow in the Pyrex.  But I guess if 
everything were reeeealy clean....

Do you mean dry?  Or with water?

Pete

-- 
Artful Bodger
http://www.artfulbodger.net
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