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A tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. [1] The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are increasingly common.
Tachymeter scale on a Citizen watch bezel. A tachymeter (pronounced / t æ ˈ k ɪ m ə t ər /) is a scale sometimes inscribed around the rim of an analog watch with a chronograph.It can be used to conveniently compute the frequency in inverse-hours of an event of a known second-defined period, such as speed (distance over hours) based on travel time (distance over speed), or measure distance ...
Wild brand subtense bar. Another device used in tacheometry to measure distance between the measuring station and a desired point is the subtense bar. [2] This is a rigid rod, usually of a material insensitive to change in temperature such as invar, of fixed length (typically 2 metres (6.6 ft)).
An auto tachometer has a sweep of about 240-250 degrees and typically uses an air core gauge. An air core gauge is a specific type of rotary actuator in an analog display gauge that allows an indicator to rotate a full 360 degrees. It is used in gauges and displays, most commonly automotive instrument clusters.
The driver's activity is displayed in this area, and is always displayed as either drive, other work, availability or rest. Earlier tachograph heads displayed the mode as a thin line in one of four concentric tracks within the activity band. These heads are known as manual heads as the activity was manually selected using the mode switch.
Equus may refer to: Equus, a genus of animals including horses, donkeys and zebras; Equus, a play by Peter Shaffer; Equus, a film adaptation of the Peter Shaffer play; Equus (comics), a comic book character; an opponent of Superman; Equus, American monthly lifestyle magazine for horse enthusiasts
Equus is a 1977 psychological drama film directed by Sidney Lumet and written by Peter Shaffer, based on his 1973 play of the same name. The film stars Richard Burton , Peter Firth , Colin Blakely , Joan Plowright , Harry Andrews , Eileen Atkins , Kate Reid and Jenny Agutter .
A digital tachograph in operation, with a driver card inserted. A digital tachograph is a device fitted to a vehicle that digitally records its speed and distance, together with the driver's activity selected from a choice of modes.