Vernier Scale on a Circle

This Demonstration shows a Vernier scale on a circle with precision 5'. To start, try to find where the line segments match up the best.

SNAPSHOTS

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DETAILS

The Vernier scale was invented in 1631 by the French mathematician Pierre Vernier (1580–1637). It was also called the nonius scale because the Portuguese mathematician Petrus Nonius (or Nunes) (1502–1578) invented a related system for the astrolabe.
Reference
[1] Wikipedia. "Vernier Scale." (Sept 27, 2012) en.wikipedia.org/wiki/Vernier_scale.
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