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    Re: Sextant certificates
    From: Alexandre Eremenko
    Date: 2006 Feb 2, 19:00 -0500

    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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