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    Re: Vernier explanation
    From: David Pike
    Date: 2022 Jun 26, 10:30 -0700

    Peter

    I’d temporarily forgotten about parallax despite my earlier comments.  If the lower scale didn’t slope into a knife edge, parallax is certainly possible.  How much would depend upon how high the edge was above the arc as indicated by my earlier example.  If it is parallax, 2 degrees lower into 1 degree 50 minutes upper, the next thing to work out is how to read the scale.  However, the tea’s ready.  DaveP

       
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