An instrument by which the velocity of machines is measured; spec. one that indicates the speed of an engine in r.p.m.
| 单词 | θ214612 |
| 释义 | society > occupation and work > equipment > machine > [noun] > instrument measuring speed or motion of machine (2) tachometer1810 An instrument by which the velocity of machines is measured; spec. one that indicates the speed of an engine in r.p.m. oscilloscope1922 A stroboscopic apparatus used to make visible irregularities in the motion of rapidly rotating or oscillating machinery. disused. |
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