How to determine current setDriftCorretion for logger?

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What steps will reproduce the problem?

After many hours I determine the drift correction value should be around 
11_000_000 million ticks per hour.

After N setDriftCorrection, I let the logger run for an extended period.  The 
clock continues to drift, more slowly. 

I imagine we want to calculate the new drift ticks per hour and add this to the 
previous value. 

How do I get at the current value in setDriftCorrection ?

From time.f line 107
_driftCorrectionNumerator dL@
will this return the current drift value, how do I combine this with the most 
recent drift calculation ?

Original issue reported on code.google.com by prof.bra...@gmail.com on 16 Sep 2013 at 2:37