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	electromagnetic wave electrometallurgy electrometer electromotive force electromotive series electron electron affinity electron biprism electron capture electron diffraction electron gun electron lens electron microscope electron optics electron probe microanalysis electron-spin resonance electronegative electronic mail electronics electronvolt electrophoresis electrophorus electroplating electropositive electroscope

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