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## What is Tachymeter?

A tachymeter is a scale found in chronograph watches and is used to measure speed and distance. It is found just inside the dial from the bezel or might be inscribed in the bezel itself in some watches. You could use a tachymeter scale on a standard time-only watch as well, but for proper use and calculations, they need the ability to start and stop timing, which is the reason why you see them mostly on chronographs only.

This scale starts at a 7-second mark at 500 units of speed. Some models also start their scales at 6 seconds and 600 units, or 9 seconds and 400 units. The basic mathematical equation T=3600/t is used to calculate the speed, where T is the tachymeter scale value and t is the elapsed time. This equation is used to convert elapsed time into speed.

### What is Tachymeter in the Watch?

Mechanical watches like watches with a tachymeter scale have helped measure distance, time, speed for a long time. They date back as far as the chronographs. By the 1930s, an ample of brands had started to produce wristwatches with tachymeter scales. In the 1950s, the chronograph became a must-have sports watch. Surprisingly, a tachymeter holds the power to make your chronograph feel more useful, to this very day.

## How to Use Tachymeter?

The use of a tachymeter basically depends on the relationship between speed, time, and since, something that all of us have read in our elementary school. Let us tell you how exactly you can benefit from this wonderful feature in your watches.

### How is speed measured using a Tachymeter?

The first thing you need to calculate speed is the distance between two points, and in a tachymeter, the points are designed for a single unit, either a mile or a kilometer.

You will be needed to follow these given steps to calculate the speed:

1. Find the distance between two points.
2. Start the chronograph as soon as the object passes through Point 1 or the initial point.
3. Stop the chronograph when the object crosses Point 2 or the final point.
4. Observe the point at which the chronograph seconds hand falls on the minute track.
5. Line up the hand with the tachymeter scale, and you’ll get your required speed.

### What to do when the distance is shorter than a mile?

Since the chronograph measures the distance in a single unit, you will have to base your measurements likewise. Let’s say you have to find the speed of a person running in a race, the distance of which is ¼ of a mile, you will have to look at ¼ of the tachymeter measurement.

The same technique can be used to measure the time when it is more than 60 seconds. You can also find the amount of time you take to produce something in an hour, following this method. Let’s say you take 45 seconds to fill the air in a balloon and tie it up. When you look across the tachymeter scale, it lines up with 80, which means you can fill the air in 80 balloons at an average, in a given time period of 1 hour.

### How is the distance measured using a Tachymeter?

Measuring distance and speed is quite similar. When you were measuring the speed, you needed to know the distance between two points. Now, if you’re measuring distance, you will be required to know your travelling speed, and you must also make sure that this speed is constant.

You can find the distance by following the given simple set of instructions:

1. Find out your constant travelling speed.
2. When you cross a certain point, start your chronograph.
3. When you have travelled the speed lining up with the tachymeter scale, stop the chronograph.
4. When the second’s hand of the tachymeter scale is at your travelling speed, it means you have travelled a distance of one mile.

Hence, tachymeters can be used to measure both, time and distance. In the initial use of this method, you might feel a little uncomfortable, maybe due to the math. But, we assure you, this is a great feature on your watch, that will certainly earn your affection in a few days if you keep practicing it.