How to Use a Tachymeter

Описание: If you've ever wondered what that scale etched into the outer ring of your watch is, now's the time to learn! It's called a tachymeter, and it consists of a scale that runs to 3,600, which is the number of seconds in an hour. It can be used to convert time—measured in seconds per unit—into a speed measurement in units per hour. And if you're traveling in a vehicle at a constant speed, you can also use it to calculate distance traveled. While it might sound tricky, it's pretty simple once you get used to it!