I did a back-of-the-envelope calculation today for a 10 m long pipe, 
15cm in diameter, half filled with liquid, sitting on 1 support at each 
end.  When the pipe is tilted by 1 micro radian, the difference in 
loading between the posts is the equivalent of around 3 or 4 grams.

Could this be approached by monitoring the loading on the supports?

Ian Smith
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