Many brands have now started tachymeter in their watches primarily to enhance the look of the watch, no doubt that a Tachymeter makes a watch catchy and stylish. Well there is one more use of it and that is measuring speed ! Sounds strange but its true. With different brand , tachymeter also has a wide range of speed measurement, mine a CASIO brands measures the speed up to 500 km/hr , professional Tachymeter may calculate up to 1000km/hr. Simply A tachymeter is a means of converting elapsed time in seconds per X to X per hour. Minimum speed that can be measured is about 60km/hr.
How To Measure Speed :
- Start the second hand on a mile stone and keep an eye on it, then once you reach the next mile stone just stop the watch, here second hand will point to a number on Tachymeter, the value is the speed of the car or bike .
- If we want to measure how fast the 200m athlete is running. Let’s say the athlete used 20 seconds to finish 200m running, so according to tachymeter, the speed of the athlete is 180 km/hr. However, the athlete only ran one fifth (1/5) of a kilometer, so we should divide 180 with 5 or 1/5 of 180, which mean the actual speed of the runner is 36 km per hour.
- What if the object travels too fast, such as a rocket or plane, In this case, user can increase the units of the distance covered by the object to measure a longer period of time so that the duration is greater than at least 7.2 seconds (typically the lower limit). We can measure the time taken by the object to cover 10 miles, let’s say it took 30 seconds, so the tachymeter will tell us the the speed is 120 miles per hour. However, 10 miles have been travelled, so that actual speed is 120 times of 10, which is 1200 mph.
Many people think that Tachymeter is just to enhance the look of watch,but now since you are aware of the potential use of a Tachymeter ,you can at least tell others about this tiny useful thing.