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I recently came into possession of a Cassens & Plath Horizon Ultra and
it is a very nice piece of gear.  I like it a LOT.  I thought I knew how
to read a vernier and have had no problems "reading" and using other
verniers but this particular vernier has me slightly puzzled.  There is
nothing in the sextant booklet from Cassens and Plath explaining the
vernier in detail.

Let me explain.  The vernier scale has 10 graduations using 11 marks.
My initial thought was that each graduation was .2' with the center
longer mark as zero but now I am not so sure.  It could easily be that
the "top" mark is zero and each graduation is .1' or even .2' it just
isn't clear to me at this point.  Using a magnifying glass, the "top"
mark has a small solid dot at the right end of the mark, this "dot" is
not shown below.  Besides this "dot" there are not any other marks nor
any numbers marked on the vernier scale.  Below I have tried to give a
depiction.  Any ideas where zero is and what the graduation scale might be?

Vernier Scale depiction:
________
____
____
____
____
________
____
____
____
____
________

If needed I can try to use the wife's digital camera and provide a more
detailed picture.  Celestaire has a decent picture of it here:

http://celestaire.com/pdf/MarineSextants.pdf


--Scott

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