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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" 
To: 
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."
So
> if the certificate says "correction," apply it with the sign given. That
> worked for me when taking lunars using a sextant with certificate errors
up
> 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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