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    Re: Level vials for mirror artificial horizons
    From: Bruce J. Pennino
    Date: 2013 Mar 18, 13:45 -0400
    As I wrote earlier, I've never used my front finish/first surface mirror.   Is the benefit primarily at night with dimmer stars? Worth the relatively higher cost?
    By the way , I was obsessive about the heavy/rugged  steel base plate . I was concerned about vibrations, bumping it, etc. Also, steel was convenient because there is a weld shop around the corner and these guys have been helpful with other projects. For the next AH,  I'd probably go with a base like yours or a common cutting board or equivalent.

    ----- Original Message -----
    Sent: Monday, March 18, 2013 10:52 AM
    Subject: [NavList] Re: Level vials for mirror artificial horizons

    My thanks for the Empire level suggestion. Over the weekend I did two sets of three sun sights where intercepts averaged 2nm and 1.6nm. I did side by side comparisons of 2 manufactured precision levels with bases I made myself and they averaged 0.6nm and 0.6nm for two sets of 3 sun sights. The leveling mirror base was mde from a plastic bar cutting board, brass therad inserts and carriage bolts. The total costs for the "Tru-Blu" level and the mirror base was about $40. The precision levels appear to give better results but dollar for dallar, $10 versus $50, the Empire levels are very good. If you are chasing accuracy obsessively, as I do, go with precision levels.
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