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    Re: Instumental error?
    From: Bill B
    Date: 2005 Apr 21, 00:02 -0500

    > Bill wrote:
    > "> If I recall, the specs
    >> are plus/minus 10 seconds error along  the arc (0.17').
    >> Unless you got a
    >> dud, any value higher than  0.2' is highly suspect.
    >
    > And Alex replied:
    > "Yes, I'm afraid it is a dud."
    
    Frank responded:
    >
    > I don't buy it. That the certificate *says* the error is 10 seconds doesn't
    > mean much of anything. Arc error is a correctable error and shooting
    > lunars/star-star sights is probably the best way to detect it. Build your
    > table,  and
    > then use it. And the fact that such error exists doesn't mean the instrument
    > is a "dud". Correcting for arc error, once you have determined it, is every
    > bit  as easy as correcting for index error.
    
    Frank
    
    I was looking at the bigger picture (for a refreshing change of pace).
    Celestaire, for example, speaks of accuracy by the lot.  I would expect my
    Atsra III B to be no worse than plus/minus 19" throughout the arc, maybe
    better, despite any certificate.  Any Cassens & Plath no worse than
    plus/minus 9".  Any SNO-T no worse than plus/minus 10".  Those should be
    upper limits.  That is not to say lemons do not exist.
    
    I have no cause to believe Soviet military gear would have been substandard
    (although not petite ;-)  If I accurately recall the post, some sort of cel
    nav contest was won by a Polish sailor with a SNO-T--a long run of .2'
    within known positions.  If any of the list members have more details about
    this seagoing cel-nav superstar, I would love to read them.
    
    > I don't buy it.
    
    Too bad.  I have a gut feeling Alex would be willing to sell it if the
    "right" offer came along.   Kidding aside, I believe him to be the sort
    that will persevere and defeat any idiosyncrasies the SNO-T may posses.
    
    Bill
    
    
    

       
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