单词	vernier
释义	vernier A short auxiliary scale placed beside the main scale on a measuring instrument to enable subdivisions of the main scale to be read accurately. The vernier scale is usually calibrated so that each of its divisions is 0.9 of the main scale divisions. The zero on the vernier scale is set to the observed measurement on the main scale and by noting which division on the vernier scale is exactly in line with a main scale division, the second decimal place of the measurement is obtained (see illustration). The device was invented by Pierre Vernier (1580–1637) in about 1630. Vernier scale
随便看	rationalized units ray Rayleigh criterion Rayleigh scattering Rayleigh, Lord Rayleigh-Jeans formula reactance reaction reaction propulsion reactor real gas real image real-is-positive convention recalescence recombination process rectification rectifier red dwarf red giant redshift reflectance reflecting telescope reflection refracting telescope refraction

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