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    Re: Instrument Corrections
    From: Glendon
    Date: 2003 Mar 10, 11:31 +1100

    The certificate to my 1974 Heath Hezzanith states: "The following
    corrections, in addition to Index correction should be applied to the
    readings of the arc" .... i.e. the (few) numbers shown ( maximum of +0.2')
    are corrections, not errors.
    My 1988 Russian SNO-T has no certificate of error/corrections....as best I
    can interpret the (Russian) instructions, the implication is that the
    instrument has been manufactured to a standard where there are no instrument
    errors of practical significance, and that Index errors should be corrected
    for in the usual way. I have often wondered whether this is true!!
    Lee Martin
    ----- Original Message -----
    From: "Bruce Stark" 
    Sent: Monday, March 10, 2003 6:04 AM
    Subject: Re: Instrument Corrections
    > Fred,
    > I haven't used many different sextants, but feel reasonably confident the
    > maker of yours would know the difference between "correction" and "error."
    > if the certificate says "correction," apply it with the sign given. That
    > worked for me when taking lunars using a sextant with certificate errors
    > to 1.'0 of arc.
    > Perhaps some certificates do give it as "error" and show the + or -
    > accordingly. I'd like to know.
    > Bruce

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