On Mon, 19 Apr 2010 19:20:10 +0100, Harry Bloomfield
wrote:

The Other Mike brought next idea :
The bubble in a small diameter ring say 1ft diameter will be much
more sensitive and move more with a small angle change than a bubble
in a large diameter ring of 10ft diameter

T'other way round I think 8-o

I knew what I meant, even though my fingers didn't


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