- Technical features
- Applications
- References
Technical features
The nonius was used to improve the astrolabe's accuracy. This consisted of a number of concentric circles traced on an instrument and dividing each successive one with one fewer divisions than the adjacent outer circle. On a standard scale of 90 degrees, there are an additional 44-45 concentric circles with each divided into a specific unit size such that a scale unit on position 
had an arc of 
degrees.[2][3] Thus, the outermost quadrant would comprise 90° in 90 equal divisions, the next inner would have 89 divisions, the next 88 and so on. When an angle was measured, the circle and the division on which the alidade fell was noted. A table was then consulted to provide the exact measure.[4]
Applications
The astronomer Tycho Brahe applied the nonius to the astronomic quadrant.[5][3]
In numerically controlled machines, the nonius is part of several absolute encoders, that measure linear or rotational displacements.[6]
References
2. ^1 {{cite journal|last1=Poelje|first1=Otto van|title=Diagonals and Transversals: Magnifying the Scale|journal=Journal of the Oughtred Society|date=July 25, 2004|pages=22–28|url=https://eeuwen.home.xs4all.nl/images/Pics/Kombuispraat/Pleinschaal/200410%20Diagonals%20and%20Transversals%20V13-2.pdf|accessdate=May 2, 2017}}
3. ^1 {{cite web|last1=Eisele|first1=Margarete|title=Mathematics In Europe - The Nonius|url=http://www.maths-in-europe.eu/ru/2-uncategorised/684-the-nonius|website=www.maths-in-europe.eu|accessdate=May 2, 2017|language=ru-ru}}
4. ^{{cite web|url=http://www.cienciaviva.pt/latlong/anterior/nonio2.asp|title=O conceito de nónio|author=António Estácio dos Reis|publisher=Ciência Viva|trans-title=The concept of Nonius}}
5. ^{{cite web|url=http://www.cienciaviva.pt/latlong/anterior/nonio3.asp|title=Tycho Brahe recorre ao nónio de Pedro Nunes|author=António Estácio dos Reis|publisher=Ciência Viva|trans-title=Tycho Brahe betakes Pedro Nunes' Nonius}}
6. ^{{cite web|url=http://www.sensorsmag.com/sensors/position-presence-proximity/the-vernier-scale-goes-digital-1541|title=Nonius interpolation provides excellent differential linearity and higher resolution for linear displacement measurement systems or rotary encoders}}
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