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    Re: Chasing tenths of an arc minute
    From: George Huxtable
    Date: 2010 Mar 12, 22:48 -0000

    Yes, the National Maritime Museum at Greenwich has altogether around 16
    various mariners' sextants by Ramsden, but as far as I know every one is a
    Vernier type. If Richard knows better, I would be most interested to learn
    about it.
    
    George.
    
    contact George Huxtable, at  george@hux.me.uk
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    ----- Original Message -----
    From: "Richard Reed" 
    To: 
    Sent: Friday, March 12, 2010 9:44 PM
    Subject: [NavList] Re: Chasing tenths of an arc minute
    
    
    NMM has another Ramsden from 1783.  This one has 305 mm radius, one scope,
    and looks to be a nautical instrument with a wooden handle, but I'm not sure
    whether it caught on.  In any case, it has nothing to do with the
    20th-century innovation of precision arc hobbing.
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