Thanks Silver. Unitless numbers aren't very useful. What if you add the 0.2mm tolerance to the actual measurements, do you get "16.3" and "16.4"? Maybe these are max values? I would think post 1989, with the exception of the Hubble telescope(I think that error stemmed from inch-SI unit conversion), they had the ability to measure precisely.

Kind Regards,

Raimey
rse

Last edited by ellenbr; 01/30/09 10:10 PM.