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    Re: mirror horizon
    From: Patrick Goold
    Date: 2011 Mar 24, 22:10 -0400
    Gary,
    I bought it from the site recommended by Bill Morris sometime in late December or early January on navlist.  Surplus Shed buys surplus gov and other tech org junk.  They usually have an assortment of optical glass, mirrors, etc.   Inventory varies.   Much of the stuff, even the mirrors, are described in ways that make it difficult for me to say in what general ontological category it belongs, much less what it does.  But eventually I make my way to something I need.   Good luck!


    Patrick



    On Thu, Mar 24, 2011 at 7:29 PM, Gary LaPook <glapook---.net> wrote:
    Where did you get the mirror, I might want to make one too.

    gl

    --- On Wed, 3/23/11, Patrick Goold <goold{at}vwc.edu> wrote:

    From: Patrick Goold <goold{at}vwc.edu>
    Subject: [NavList] mirror horizon
    To: "navlist" <NavList@fer3.com>
    Date: Wednesday, March 23, 2011, 1:16 PM


    I have finally put together an artificial horizon using a front-surface mirror.  My hope is to be able to do star and planets sights with it, which I cannot do with my Davis artificial horizon.  I found an inexpensive optical quality mirror on-line.  I drilled and tapped four holes in a cheap polypro cutting board for inch-and-a-quarter-long 3/8th-inch machine-thread bolts to serve as levelers and then attached the mirror using standard bathroom mirror brackets.  The trick will be getting the thing adequately level.   William Morris kindly supplied me with a very sensitive level vial.  It is not mounted to the device.  I set it diagonally across the mirror and level it, move it to the other diagonal and repeat, switch it end to end and repeat both those steps and then repeat as necessary.   A picture of this simple apparatus is attached.  Any suggestions about how to improve it (without vastly increasing its cost) would be welcome.

    I haven't yet taken any sights using it.  It takes twenty minutes to level the thing, sitting at my dining room table.  That is, provided no one is moving about on the ground floor of my house while I am doing it.   The level is very sensitive.  It will not be easy getting it set up outside.



    --
    Dr. Patrick Goold
    Department of Philosophy
    Virginia Wesleyan College
    Norfolk, VA 23502
    757 455 3357

    Charles Olson: "Love the World -- and stay inside it."




    --
    Dr. Patrick Goold
    Department of Philosophy
    Virginia Wesleyan College
    Norfolk, VA 23502
    757 455 3357

    Charles Olson: "Love the World -- and stay inside it."

       
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