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    Re: Arificial Horizons and Tea
    From: Bruce Stark
    Date: 2003 Jul 10, 20:22 EDT

    George,
    
    It's just a guess, but I imagine the English instrument makers of that day
    could turn out a bubble level as accurate as you could wish. No doubt it would
    be expensive.
    
    I believe Lewis used the water horizon unless the object was too dim to
    reflect in it. Though mercury horizons were standard, the captains didn't take one,
    probably for the reasons Kieran has laid out. The captains certainly had no
    concern about health issues with mercury. Must have had enough in their medical
    kit to fill several artificial horizon flasks. They used it to treat syphilis
    and, in Dr. Rush's pills -- which the men spoke of as "thunder bolts" -- as a
    laxative.
    
    I don't have the Journals for the Fort Mandan part of the trip, but
    understand Lewis chose the liquid horizon for his observations there. This when the
    river and everything else was frozen solid. "Artificial horizon drinkability"
    could have been a factor, since the only thing that would stay liquid in the pan
    was whisky.
    
    Others will have to answer your questions about leveled horizons. But I think
    one problem with them is that it's not always easy to find, or set up, a base
    that can be depended on not to shift slightly.
    
    Bruce
    
    
    

       
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