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    Re: Fw: Image of Sextant Used by Worsley
    From: Brad Morris
    Date: 2009 Mar 6, 17:00 -0800

    Hi George
    
    The helical screw is mounted on a spring mounted hinge, which keeps the screw 
    in contact with the teeth milled into the back of the arc.
    
    When you press the release, the screw lifts off of the arc and you can easily 
    move the helical screw to another section of the arc.
    
    You could (with a lot of effort) use the adjusting knob to move the vernier 
    from one end of the arc to the other, but who would want to?
    
    Best Regards
    Brad
    
    
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