Tachymeter Explained: How That Scale on Your Chronograph Actually Works
The tachymeter scale on a chronograph turns elapsed time into speed. Here is the math behind it, how to actually use it, and why it stops working below 60 units per hour.
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What Is a Chronograph? How the Stopwatch on Your Wrist Actually Works
What is a chronograph? A working dealer's plain-English guide to the stopwatch complication: how the pushers, subdials, and tachymeter work, why a chronograph is not a chronometer, the difference between a column wheel and a cam, and the famous chronographs worth knowing.