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Yes, Henry, if you have computed the value 1' 30" for 30 degs yourself from 
the usual tables of the refraction and parallax and didn't taken it from some 
prepared table in your table set (as I supposed), this is a beautiful 
explanation.

I have seen the term "PL" for other bases than 10800 secs, too. But not at the 
beginning of the 19th century and only in German, it's true.

Hello, Bruce.

Jan


----- Original Message -----
From: "Bruce Stark" 
To: 
Sent: Wednesday, August 25, 2004 10:44 PM
Subject: Re:       Proportional logs, etc.


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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