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    Re: Floating mirror
    From: Alexandre Eremenko
    Date: 2015 Apr 20, 12:04 -0400

    I do not think you can use it as an artificial horizon:-)
    If a glass mirror floates, this is because of its frame.
    I do not think that the frame is made with enough precision
    to ensure that the mirror surface, when it floats, is horizontal
    even within 1'.
    
    Alex.
    
    On Mon, 20 Apr 2015, Dave Walden wrote:
    
    > A $3 plastic camping mirror from REI.  Floats in a bucket of water.  
    (backing may have issues after a while)
    > Not suprisingly, clouds all day, so no testing.
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