  The Weigelt knots, dense slow-moving ejecta near eta Car, are mysterious in
structure as well as in origin. Using a special set of spectrograms obtained
with the HST/STIS, we have partially resolved the ionization zones of one knot
to an accuracy of about 10 mas. Contrary to simple models, higher ionization
levels occur on the_outer_ side of the knot, i.e., farther from the star. They
cannot represent a bow shock, and no truly satisfying explanation is yet
available -- though we sketch one tentative possibility. We emphasize that STIS
spectrograms provide far more reliable spatial measurements of the Weigelt
Knots than HST images do, and this technique can also be applied to the knots'
proper motion problem.
