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    Re: Sextant frames
    From: Jeremy C
    Date: 2009 Apr 16, 06:44 -0700

    That certainly is interesting reading (and should be copied to the
    sextant group on yahoo).  I have used sextants of all natures at sea
    (excluding plastic which I've only played with on land).  I haven't
    noticed much difference in the accuracy of my sights, but there
    certainly is a cosmetic and weight difference.  I found that my
    selection of scopes increased my accuracy, but the material of the
    sextant seemed irrelevant.
    
    One question however.  Do the differing co-efficients of expansions
    make any difference in the consitancy of the sight?  In other words,
    when I bring a sextant out from the AC of the bridge to the hot bridge
    wing, will a bronze or aluminum sextant tend to warp at all, and if
    so, to what degree?  I would hope that that frame shape would take
    care of this issue and by the time the fog cleared on the mirrors, I
    could be confident of the sight.
    
    When I bought my sextant last year, I went with the bronze Cassens &
    Plath, not because it was bronze, but because it had the highest
    claimed accuracy of sextants available new, and because of the
    polarized shade option.  The C. Plath Navistar is not bronze, but some
    sort of aluminum looking alloy.  It is quite light, and has a very
    fine claimed accuracy.  My issues with that sextant extend beyond the
    material and more to the ergonomics and usability (very poor shading).
    
    Jeremy
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