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Dear Fred and John,

> Is this plus or minus 20" or plus or minus 10"?

This is my sertificate issued by Freiberger:
0  10  20  30   40  50  60  70  80  90  100  110  120
0" -4" -4" +10" +6" -1" +4" +5" -5" +4" +4"  +3"  +14"

Cassens-Plath, as I said before, wrote "no error for practical purposes"
The original SNO-T certificate which says +10" everywhere on the arc
is of course pure nonsense which only shows that the person who filled
it did not understand what s/he was doing.
There is even a name and the signature of this person on the
certificate:-)

If they wrote 10" without + sign, I would ionterpret this as
"at most 10" which would be roughly equivalent to the C-P
statement.
Alex.

> On Feb 2, 2006, at 8:55 AM, Alexandre E Eremenko wrote:
>
> > Ken,
> > Thank you for reminding us this number 20" approx 0.3'.
> > It is true, within this margin, the two certificates I obtained
> > last summer agree: in the sequence of numbers produced by Freiberger,
> > none is greater than 20".
> >
> > On the other hand, for the lunars (which is the primary use of my
> > sextant)
> > unknown 0.3' arc non-uniformity is too bad.
> > So "all practical purposes" by this definition do not include
> > lunars:-)
> >
> >
> > A
> >
> > On Wed, 1 Feb 2006, Ken Gebhart wrote:
> >
> >> Just for the record, I did state what the phrase " the error is
> >> negligeable
> >> for practical purposes" meant. That is, less than 20 sec error, by
> >> German HO
> >> dictate.
>

   

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