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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 ...
The term chronograph comes from the Greek χρονογράφος (khronográphos 'time recording'), from χρόνος (khrónos 'time') and γράφω (gráphō 'to write'). '). Early versions of the chronograph are the only ones that actually used any "writing": marking the dial with a small pen attached to the index so that the length of the pen mark would indicate how much time had
The tape recorder's drive electronics use signals from the tachometer to ensure that the tape is played at the proper speed. The signal is compared to a reference signal (either a quartz crystal or alternating current from the mains). The comparison of the two frequencies drives the speed of the tape transport. When the tach signal and the ...
Tachymeter may refer to: Tachymeter (survey) or tacheometer, a type of theodolite used for rapid measurements of distance Tachymeter (watch) , a scale sometimes inscribed around the rim of an analogue watch
Each Rolex Daytona watch has a unique serial number, which is typically a 4-8 digit number engraved between the lugs on the 6 o'clock side of the case, behind the bracelet. The serial number can provide valuable information about the watch, including its production date.
Radar speed gun, a Doppler radar device, using the Doppler effect for indirect measurement of velocity. Speedometer; Tachometer (speed of rotation) Tachymeter; Variometer (rate of climb or descent) Velocimetry (measurement of fluid velocity) For the ranges of speed-values see: Orders of magnitude (speed)
Rolex Sea-Dweller 4000 reference 16600 produced between 1989 and 2009 with a 1,220 m (4,000 ft) depth rating. The Rolex Oyster Perpetual Date Sea-Dweller is a line of diver's watches manufactured by Rolex, with an underwater diving depth rating of 1,220 meters (4 000 ft) and up to 3,900 metres (12,800 ft) for the Sea-Dweller Deepsea variant.
Inside a chronometer mechanism (c. 1904)A chronometer (Ancient Greek: χρονόμετρον, khronómetron, "time measurer") is an extraordinarily accurate mechanical timepiece, with an original focus on the needs of maritime navigation.