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    Re: Calibrating a sextant scale
    From: Alexandre Eremenko
    Date: 2007 Nov 22, 16:56 -0500

    Dear Paul,
    > That's a good point.
    > The test procedure for the Navy Mark 3 sextant used
    > two collimators and a precision rotary table.
    I understood from your previous message
    that you have a theodolite and collimators
    and you are going to make these tests soon,
    and tell us the results for the three sextants
    you mention.
    But a precision rotary table is related to another
    experiment. Or you have this piece of equipment as well?
    In your previous message you mention that all needed
    equipment is available on e-bay. Perhaps.
    From time to time I look for a theodolite there,
    and the price of a Wild T2 that you mention is well
    over 1000 bucks, usually closer to 2000.
    They rarely mention the angle resolution of theodolites
    on e-bay (as it happens with sextants, the sellers usually
    have no idea what the instrument is for, and do not
    answer technical questions). Few Russian theodolites I saw
    are cheaper than T2 but in most cases I don't know how
    accurate they are. Some are mentioned with 5" resolution
    which is the bare minimum for sextant testing.
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