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It is simple enough to test to derive the standard error of a direction angle taken as the mean of both faces. In your situation, A standard error of +/-1.0" for directions taken (mean of F Lt and F Rt) with the lesser quality Wild T-2 means that you'd expect the angles to have standard errors of about +/-1.4" unless the Wild instruments are much worse than the Zeiss one-second theodolites.
What does analysis of variance in your observations give you for a standard error?
Kent McMillan, RPLS Austin TX
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