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Brad,
Tnhnaks for your advice.  I'll see if I can check the parallelism as you describe.

GTeorge, Thanks for your advice as well.  I will either get a piece of black 
glass (and devise a means of leveling it as I have read in past posteings) or 
at least try some sort of non-reflective treatment for the pan bottom.

I don't particularly suspect that I'm getting a double image from the oil pan, 
however.  When sighting the sun, I use a colored cover over the artificial 
horizon pan, and different colored filters between my eye and the sun, and I 
get two distinctly colored images, say green from the sky and yellow from the 
pan.  It is these that can't seem to be brought very near each other 
horizonatally.  That is, until for one luck second they slip right over one 
another, and if I'm quick with the micrometer I can get my shot beforfe they 
agaion wobble apart.

By the way, I had also meant to ask:  Should I ignore altitude correction when 
using an artificial horizon?  Clearly no correction for semi-diameter should 
be needed, because I am superimposing full discs of the sun and its 
reflection, center-over-center, rather than touching the upper or lower limb 
to the horizon.  But I guess I can't grasp the principle behind altitude 
correction sufficiently to decide whether it counts in this situation.

-John


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