How to Use a Tachymeter to Measure Speed
To gauge the speed of an object using a tachymeter, you need to know the set distance between two points. Let’s say you’re at a racetrack and you know the distance between turn 1 and turn 2 is 1 mile. With that knowledge, you can measure the average speed of a car.
As soon as the car passes turn 1, push the start button on your chronograph. When it arrives at turn 2, stop it. According to your chronograph, it took the car 40 seconds to go from turn 1 to turn 2.
Looking at your tachymeter on your bezel, 40 seconds lines up with the 91 hash mark on the tachymeter. That means the car was averaging 91 mph as it was traveling from turn 1 to turn 2.
You can use the tachymeter for other measurement units like kilometers as well; it’s a neutral scale. For example, let’s say the racetrack you’re at is measured in kilometers. You know that the distance between turn 1 and turn 2 is exactly 1 km.
As soon as the car passes turn 1, start the chronograph. When it reaches turn 2, stop it.
...[ Continue to next page ]
Share This Post
