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    Re: Artificial horizon question
    From: J Parsons
    Date: 2009 Apr 20, 12:51 -0700

    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.
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