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    Re: Vernier explanation
    From: Frank Reed
    Date: 2022 Jun 27, 07:29 -0700

    Peter Monta, you wrote:
    "Hmm.  Could the vernier have been mis-engraved, perhaps by configuring the dividing engine with settings intended for the arc?  How would that have gotten past final quality control?"

    It's possible, and I have had the same thought. Antique things survive for many reasons, and one potential cause is "unsellable stock". This is a last resort explanation, but when everything else is ruled out... that's it.

    Note also that the sextant can be read by visual interpolation on the main arc to about +/-2 minutes of arc. That's good enough for most practical celestial navigation (excluding exotica, like lunars).

    Frank Reed

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