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Scott, you wrote:
" 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."

I was surprised that nobody else has answered this question. I think your
analysis here is correct. That little "dot" does indicate the zero, and the
individual marks are tenths of a minute of arc. In theory, you could use the
central mark as zero (which would require a different index correction), but
then you would have to count the upper markings as negative tenths, which
would become annoying. The top line is the proper zero.

 -FER


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