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    Re: Mirror horizon
    From: Marty Lyons
    Date: 2023 Sep 8, 17:36 -0700

    This is quite similar to the one I made using mirror tile. Three levelers are the way to go and their threads should be the finest thread you can find. The key is the accuracy of the levels you use. I use 5"-6" levels from surveying transits with feet I made to allow them to sit flat. The feet were then lapped to calibrate the level to near perfect. Bullseye levels are notoriusly inaccurate. The mirror is not firmly attached to the plywood base, but rather allowed to float on thin foam tape. The mirror tile is not a first surface mirror and there can be secondary reflections at times, but it's very easy to discern the primary image from the secondary. I find it much easier to use than the small Davis AH, and no liquid to mess with. I have never compared results to a liquid AH or GPS Anti Spoof, a good project whem temps get cooler.


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