NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Artificial horizon question
From: J Parsons
Date: 2009 Apr 20, 12:51 -0700
From: J Parsons
Date: 2009 Apr 20, 12:51 -0700
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 --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---