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Pierre vernier

[vur-nee-er; French ver-nyey] /ˈvɜr ni ər; French vɛrˈnyeɪ/

[pyer] /pyɛr/ (Show IPA), 1580–1637, French mathematician and inventor.
a small movable scale running parallel to the main graduated scale in certain measuring instruments, such as theodolites, used to obtain a fractional reading of one of the divisions on the main scale
an auxiliary device for making a fine adjustment to an instrument, usually by means of a fine screw thread
(modifier) relating to or fitted with a vernier: a vernier scale, a vernier barometer

1766, device for making precise measurements, from name of inventor, French mathematician Paul Vernier (1580-1637), who described it in a tract published 1631.
French mathematician and maker of scientific instruments, known especially for his invention of an auxiliary scale (named after him) used for obtaining a highly precise reading of a subdivision of an ordinary scale.


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