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A gyro sensor or gyrometer registers or measures rotary movements .

A gyroscope ( gyro ) or a laser gyro are examples of gyro sensors.

Tachometer, historic

Brown gyrometer (around 1880)

Gyrometer is also the name for instruments used in the past for measuring the speed of rotation of rotating bodies and thus a tachometer . It was previously used to determine the speed of the drive shafts of mechanical machines .
In the usual design ("Brown gyrometer"), two masses were attached to the rotating axis, which were carried outwards by the centrifugal force during the rotation. A thread that connects both masses then shows the number of revolutions per minute on the common axis . In some constructions the masses were driven back again by their own weight , in others the elasticity of the fastening rods was used.
In many self-regulating steam engines, the steam supply was automatically regulated by such a centrifugal regulator.
Today, time measurement is far more accurate, so that the speed of rotation is measured using the number of revolutions in a period and mechanical gyrometers are practically no longer used.

Web links

Wiktionary: Gyrometer  - explanations of meanings, word origins, synonyms, translations