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Hi Bill

One of the 'shades' is clear. I haven't quite figured out what the use
of that shade is.  

The star scope suffers from an unfortunate mechanical weakness, in that
the screw adjustment, while parallel to the longitudinal axis, is offset
from that axis. This provides a moment by which the mechanical fixings
at the attachment point have become loose.  The star scope can be used,
but it takes quite a bit of time to get into focus as the adjustment no
longer works as desired.  I am considering having this tweaked at a
machine shop so that it functions properly again.  

There are two scopes which look nearly identical to the one presented in
the cover image.  One is exactly as you say, a sighting tube.  The other
is a low magnification scope.  They can be seen in the sextant image in
the lower left hand corner of the box.  The low magnification scope has
the two parallel wires by which you can obtain the parallelism of the
scope to the arc.  Which one was used for the painting would be very
hard to tell.

Best Regards
Brad



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