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    Re: Double vial horizon prototype
    From: Randall Morrow
    Date: 2012 Jan 10, 09:00 -0800

    First-surface mirrors are available through http://www.alpineglass.com

    The web site shows a sheet large enough for at least 4 each, 6 x 6 mirrors and they will cut this for you.   In order to get just one piece I had to exchange a few e-mails with them but they were very helpful and prices reasonable.  I paid $16 plus shipping for my single, 6.5 inch square mirror and received in a few days.   The mirror is used by people who make kaleidoscopes and is very flat and clear edge to edge, but much cheaper than any "scientific" sources.   They are located in the central valley of California.

    Randall F Morrow PT
    Kern County - Bakersfield

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    "Paul Saffo" <psaffo@mac.com>
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    01/09/2012 07:00 PM

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    [NavList] Re: Double vial horizon prototype

    Very elegant work! A question and a thought:
    -consider using a used surveyor's tribrach for your leveling base. They are usu available on eBay for under $50 and will give you very precise control over the leveling screws. Then you can attach your plate/mirror to an adaptor that locks into the tribrach (seco -www.surveying.com makes one, but they can be had for less on eBay). I did this with some schott black glass and was pretty happy with the result, but you will def need bubble levels that rest atop the glass directly.

    -- and a question. Where are you getting the front-silvered glass? I've hunted around and can't find any that doesn't cost a fortune!

    (Paul Saffo paul@saffo.com)
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