pierre vernier

noun

1. Pierre [pyer] /pyɛr/, 1580–1637, French mathematician and inventor.

noun

1. 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
2. an auxiliary device for making a fine adjustment to an instrument, usually by means of a fine screw thread
3. (modifier) relating to or fitted with a verniera vernier scale; a vernier barometer

n.1766, device for making precise measurements, from name of inventor, French mathematician Paul Vernier (1580-1637), who described it in a tract published 1631.

1. 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.