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From: Bruce Stark (no email)
Date: Wed Aug 25 2004 - 16:44:25 EDT
Henry,
I'm thinking the problem comes from using a slightly different value of
refraction. A change of less than one second of arc in the refraction correction
would change the PL enough to make your calculation agree with that table.
There were a number of ways of calculating refraction, and tables didn't
always agree precisely.
So far as I know, the term "Proportioning Logs" was used only for the kind
you are familiar with, though the idea was used with other intervals.
Bruce
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