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    Re: Measuring sensitivity of precision levels
    From: Bill Morris
    Date: 2009 Mar 1, 11:04 -0800

    Hein
    
    A rough and ready method is to mount it on a base of some sort. A 300 mm 
    length of, say 6 mm x 25 mm cold rolled steel would do. Place that in turn on 
    a reasonably flat, horizontal surface, ideally a surface plate, but the top 
    of a saw bench would do. There will be some line on that plane that is 
    horizontal.
    Find it by rotating base and level until the bubble centres. Insert a feeler 
    gauge of known thickness under one end  and observe how much the bubble 
    moves. If the base of the level is reasonably long and the surface reasonably 
    flat, you don't even need the extra bit of steel.
    
    This is the essence of the National Physical Laboratory Small-angle Generator 
    except that it is more refined and uses slip gauges to generate the small 
    angles.
    
    If you got a 20 second level for $20, you did very well.
    
    Bill Morris
    Pukenui
    New Zealand
    
    
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