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    Re: Mercury artificial horizons
    From: Paul Hirose
    Date: 2013 Dec 31, 16:51 -0800

    In his 1901 book the famous instrument maker William Stanley warned of
    the hazard of mercury - to sextants. "The smallest particle, if it
    touches the frame, will eat into the brass and destroy its strength."
    
    http://books.google.com/books?id=QzM7AAAAMAAJ&jtp=400
    
    Several types of artificial horizon are described later in that chapter.
    
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