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    F. J. Lemcke vernier sextant on eBay
    From: Noell Wilson
    Date: 2012 Mar 17, 17:29 -0700

    There is an interesting vernier sextant on eBay now:
    # 390399265972

    It's a Dutch vernier with several unusual features:
    Legs are on the front so you can put it down with the handle up.
    It only has 1 degree marks on the arc, 0 to 60' on the vernier, but 5' steps on the vernier. Was that considered close enough if you weren't doing lunars?
    Flat brass/bronze construction. No stiffning ribs, Light delicate construction.
    There is a precise looking screw adjustment on the horizon mirror.
    I don't see a tangent screw. I can't tell if the screw on the arm just locks the arm and it has to be positioned manually or if the screw rolls against the underside of the arc. There are no teeth on the outer rim of the arc.
    This is a nicely made and appropriately priced ($435) sextant - not crude junk. I can't reconcile the 5' marks and what appears to be rough positioning of the arm with the rest of the well thought out features.
    Any ideas?
    Regards, Noell Wilson
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