A study of the accuracy of scale graduations on a group of European astrolabes
Precision measurements have been made of the scales on a group of European astrolabes manufactured between c . 1450 and 1659. Little is known from documentary sources of the construction and scale-dividing methods used by late-medieval craftsmen. The measurements of the present group of twenty-four scales have been analysed statistically, so that the parameters of accuracy expected of them can be deduced. Scribing marks and other features give clear indications of how the scales were constructed.
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