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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.

Mike


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