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    Re: What is a "Class A" sextant?
    From: Noell Wilson
    Date: 2014 Jan 21, 11:23 -0800

    This is just another data point.
    Attached is the 1912 calibration sheet from Kew Observatory, preprinted "Class B", and stating 0'0" for all angles listed.
    So - 0'0" is not the criteria.
    This Weilbach vernier sextant has a minimum reading differential of 15" so maybe one vote for precise measurement capability - not necessarily accuracy.
    It's not an octant as the sheet says. The arc goes to 120 degrees but the arm stops a few degrees shy of full scale. It's an almost-sextant.
    Regards, Noell
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