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    Re: Vernier explanation
    From: Michael Bradley
    Date: 2022 Jun 27, 14:37 -0700

    Peter, 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?'

    Mis-engraving does happen. A batch of the Francis Barker box sextant had that very build error. When I bought mine about fifteen years ago, the build error was a thing you had to look out for ...

    All the best

    Michael Bradley

       
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