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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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