Noun
An instrument for measuring the velocity, or indicating changes in the velocity, of a moving body or substance.
An instrument for measuring the velocity of running water in a river or canal, consisting of a wheel with inclined vanes, which is turned by the current. The rotations of the wheel are recorded by clockwork.
An instrument for showing at any moment the speed of a revolving shaft, consisting of a delicate revolving conical pendulum which is driven by the shaft, and the action of which by change of speed moves a pointer which indicates the speed on a graduated dial.
An instrument for measuring the velocity of the blood; a haematachometer.
Source: Webster's dictionaryThe 1977 Gremlin X model included a new digital tachometer and three-point retractable seatbelts, as well as new in-house VAM designs for the seats. Source: Internet
Once the operator took his finger off, the player would speed up until its tachometer was back in phase with the master, and as this happened, the phasing effect would appear to slide up the frequency spectrum. Source: Internet
The energy dissipated can be accurately calculated given the known moment of inertia of the flywheel and a tachometer to measure the deceleration of the flywheel. Source: Internet