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    Re: Hybrid Artificial Horizon
    From: Bill B
    Date: 2008 Sep 13, 00:33 -0400

    George Huxtable wrote
    >
    > But the big problem, as I see it, is to avoid the trapping of air bubbles at
    > the under surface, and for that I have no solution.
    
    Perhaps a photographic film-development wetting solution, the purpose of
    which I recall was to reduce surface tension and allow water to flow off
    washed film as a sheet before/while drying so water spots did not form on
    the film.
    
    No chemist here, but there seems to short and long polymer chain dish
    detergent, the later if memory serves is illegal to use when washing a
    dry-sailed boat hull before racing.
    
    I recall a bubble formula for kids (or the occasional old kid ;-) making
    gigantic soap bubbles used glycerin and Dawn soap.  I m not certain what the
    glycerin actually did (perhaps counter to what Ken wants?), but it is a
    thought.
    
    Also, does the float need a bottom?  It could be open if the containing
    vessel was deep enough, which would eliminate the bottom surface, and leave
    only vertical surfaces submerged that would be less likely to trap and hold
    air bubbles.
    
    Another thought, if you are handy with a table saw, is constructing the
    float box (open bottom) top and sides from Plexiglas the same size as the
    mirror.  Using solvent cement on the plexi seams would eliminate the uneven
    nature and resulting balance problems caused by uneven application inherent
    with thickened adhesives in basement/garage glue ups.
    
    Bill B.
    
    
    
    
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