[ATM] correction -+

["KR" <kreid@primus.ca>]

Hello list,

    Twice I've asked myself, what value of correction is on the level of a 
RMS value of 6, a PV of 1/13, strel .988?
I don't recall any discussion on the matter. When you approach very good 
readings, the temptation arises; I can't make it around the barrel again 
without loosing good Foucault results, so the good-enough becomes relevant.
    This is plate glass, f/6. If I do a set of readings in the morning when 
it is warming up, they are different than an evening set when cooling. I 
will continue to average readings, so far -1.06, but they have ranged 
from -1.065 down to -1.06 (not really an average). If plate glass gives such 
wide ranging results, I ask what value of correction weighs in with good 
Foucault readings?
    Star test will tell in the end. Does anyone have thoughts on this?
Thanks   KMR 

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