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Re: [ATM] Dumb Question: how to measure a...

Mutilab, You do not say what degree of accuracy you need. For a Quick rough 
test:-  put the glass on a sheet of paper and draw a mark around it with a 
very sharp pencil.  Rotate the glass 90degrees, resharpen your pencil and 
repeat. Then turn to 180 degrees and repeat again. If you now have one clean 
circle your class is circular If you have three circles it is not.

                                                 Malcolm

----- Original Message ----- 
From: "Mutalib Abdallah" <omegatroid@hotmail.com>
To: <atm@atmlist.net>
Sent: Wednesday, May 31, 2006 8:00 AM
Subject: [ATM] Dumb Question: how to measure a...


> Circle.
>
> Given a circle of glass, how can I measure it to characterize its
> circularity?   Assume I do not know where on the glass is the "center", 
> if,
> in fact a center exists.



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