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The agrument about levels strikes me as an excellent example of the 
precision vs accuracy problem. While a carefully used bubble level is 
probably more precise in the sense that a smaller change can be detected, 
the accuracy of a well calibrated electronic level is almost certainly 

I think that one could make reasonable agruments on either side of the 
question of which is more important in the construction of a Velocity, 
accuracy or precision. Personally I wouldn't give up my electronic level.

Don Royer