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

On Wed, 31 May 2006, Malcolm Macdonald wrote:

> 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

A square passes this test.

Dave

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