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What is a chronograph and how does it work?

Posted on October 09 2018

Rolex Daytona 116500LN
Two push-pieces, three subdials, multiple hands – that describes almost any chronograph. But what exactly is this popular watch type? And how does it work? 

 

What is a chronograph?

The term ‘chronograph’ means ‘time recorder’ and usually refers to watches with a stopwatch function. Like a stopwatch, you can use a chronograph to measure periods of time. It also displays the time and often the date as well.

What’s more, many chronographs have an additional scale for making calculations, such as speed. A tachymeter scale is best suited for this job and is available on numerous models. Telemeter and pulsometer scales are much less common. Doctors used to use the latter to determine a patient’s pulse. On the other hand, you can use a telemeter scale to work out distances, such as how far an approaching storm is from you.

The chronograph is a “multi-tool” among wristwatches, so it should come as no surprise that so many watch fans want to call one of these functional watches their own.

How does a chronograph work?

Operating a chronograph is actually quite simple: One push-piece starts and stops the process, and the other resets it back to zero. Both push-pieces are usually located on the right side of the case – one at 2 o’clock for stopping and starting and another at 4 o’clock to reset the function.

The central second hand measures elapsed seconds and fractions of a second for the timing function. A subdial, known as a small-seconds dial, displays the “normal” seconds with a small second hand. When you’re not using the stopwatch, be sure to stop the chronograph function. Allowing the chronograph hands to run continuously puts unnecessary strain on the entire movement and wears down the components much more quickly.

A vast majority of these “stopwatches” have two additional subdials that count the minutes and hours. You can use most chronographs to measure periods of time of up to 12 hours.

However, there are chronographs with only two subdials – usually a small-seconds dial and minute counter. Most of these watches can time up to 30 or 60 minutes.

Chronographs with a single push-piece are quite rare. It is usually integrated into the crown and is responsible for all three steps: starting, stopping, and resetting.

 

Omega Speedmaster Moonwatch