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    Re: The backstaff. was: Re: The Shovell disaster
    From: Michael Daly
    Date: 2007 Nov 06, 11:35 -0500

    Nicol�s de Hilster wrote:
    > Yesterday I have been out in the field testing several instruments: A 
    > demi-cross, Master Hood's cross-staff, a cross-staff (used in the Dutch 
    > fashion) and a Davis Quadrant.
    I'd be interested in seeing a photo or diagram of Master Hood's 
    cross-staff.  Have you hidden it on your web site?  I've never heard of 
    this instrument and can't find any info on it.
    >  From this test it also became clear that the cross-staff and demi-cross 
    > perform similarly, but giving excellent results (average error 2 arc 
    > minutes over all data). The Davis Quadrant remains the winner when 
    > comparing handling, something that can be seen from the amount of data 
    > collected from it. None of the period instruments tested so far gives a 
    > better feel and quicker observations. This also explains the popularity 
    > of the instrument.
    The knowledge that the Davis quadrant "feels good" is a significant thing.
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