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Erschienen in:
2010 | OriginalPaper | Buchkapitel
The Nonius Scale
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Abstract
In the 16th century, sea navigation still depended on mariner’s astrolabes and other relatively primitive instruments for measuring astronomical altitudes. The precision of these instruments was greatly limited by the graduated scale they used, which was normally based on a minimum unit of one degree and could be subdivided into half-degrees but not into smaller units, as the measurement marks engraved in the metal instruments had to have a certain width, and began to become indistinguishable if placed too close together.