Vernier_scale_Wikipe - Vernier scale Wikipedia the free encyclopedia http/en.wikipedia.org/wiki/Vernier Your continued donations keep Wikipedia

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http://en.wikipedia.org/wiki/Vernier 1 of 4 9/9/2007 8:02 PM Vernier scale From Wikipedia, the free encyclopedia (Redirected from Vernier) For the spacecraft component, see Vernier thruster. A vernier scale lets one read more precisely from an evenly divided straight or circular measurement scale. It is fitted with a sliding secondary scale that is used to indicate where the measurement lies when it is in-between two of the marks on the main scale. It was invented in its modern form in 1631 by the French mathematician Augustus Vernier (1580–1637). In some languages, this device is called a nonius , which is the Latin name of the Portuguese astronomer and mathematician Pedro Nunes (1492–1578) who invented the principle. Another theory is that this name is from the Latin "nona" meaning "9" and therefore "nonius" means a "ninth" of the main scale. (Note - Wiki contains an entry for Pierre Vernier, but not Augustus Vernier - also, many sources list his birth and death dates as 1584 and 1638 - There may be an error in the current entry). Verniers are common on sextants used in navigation, scientific instruments and machinists' measuring tools (all sorts, but especially calipers and micrometers) and on theodolites used in surveying. When a measurement is taken by mechanical means using one of the above mentioned instruments, the measure is read off a finely marked data scale (the "fixed" scale, in the diagram). The measure taken will usually be between two of the smallest gradations on this scale. The indicating scale ("vernier" in the diagram) is used to provide an even finer additional level of precision without resorting to estimation. A set of vernier calipers.
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This note was uploaded on 07/23/2008 for the course ME 345 taught by Professor Staff during the Spring '08 term at Pennsylvania State University, University Park.

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Vernier_scale_Wikipe - Vernier scale Wikipedia the free encyclopedia http/en.wikipedia.org/wiki/Vernier Your continued donations keep Wikipedia

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