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    Re: Sextants, vernier and micrometer.
    From: George Huxtable
    Date: 2006 Nov 1, 22:48 -0000

    Alex wrote, on 31 Oct, about a prospective sextant,
    
    | The seller says that there is no adjusting tool.
    | It seems to me that on this type of a sextant, one
    | does not need any tool to adjust the mirrors:
    | the screws can be rortated with fingers, am I right?
    
    I think rotation with the fingers would be too crude. The adjusting
    screw will probably have a pair of cross-holes in the cap into which a
    pin can be inserted as a tommy-bar for very careful adjustment.
    Usually, an object that looks rather like a hatpin, but with a fancy
    brass knob, is supplied, and this has a slight taper so that it gives
    a good fit without wobbles. The brass knob is no more than decoration.
    A suitably chosen twist-drill ought to do the job.
    
    George.
    
    contact George Huxtable at george@huxtable.u-net.com
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    
    
    
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