What Is Chronograph Movement?

chronograph-movement Credit: tongeron91/CC-BY 2.0

Chronograph movement is commonly related to watches and is an almost perfect way to accurately tell time. Watches with chronograph movement are more accurate than self-winding watches or automatic watches.

A watch with chronograph movement has stopwatch capabilities. It accurately measures elapsed time in seconds, minutes and hours. A watch earns the designation "chronometer" after it has passed multiple tests administered by the Swiss Official Chronometer Control. The tests take place over 15 days and include testing the watch performance through changing temperatures, different positions and being under water.

When the upper push-button is pressed, the operating lever pulls the pillar wheel by one notch. The pillar wheel moves the brake out of the way, and the chronograph runner is free. The pillar wheel also pushes the sliding gear assembly, which moves towards the center and engages the chronograph runner. The hour clutch lever engages the hour recording wheel. After each minute, a small arm on the chronograph runner moves the intermediate wheel by one tooth, which moves the minute recording wheel by one tooth. When the upper push-button is pressed a second time, the sliding gear assemblies move away form the chronograph runner and the hour recording wheel. The brake moves against the chronograph runner to stop it. When the upper push-button is pressed a third time, a hammer moves against the chronograph runner to return the minute and hour recording hands to zero.