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Clockmaking as a precision craft developed over centuries, moving from bulky weight-driven mechanisms in church towers to small, portable timepieces worn on the wrist. A major breakthrough came with the invention of the balance spring in the seventeenth century, which regulated the oscillation of a balance wheel and dramatically improved accuracy in smaller clocks and watches. Skilled clockmakers had to master not only mechanical assembly but also the mathematics of gear ratios, ensuring that each wheel turned at precisely the right speed relative to the others. Marine chronometers, a specialised branch of the craft, became essential for navigation, since accurately knowing the time at a reference location allowed sailors to calculate longitude. Today, mechanical clockmaking survives largely as a luxury and heritage craft, since quartz and digital timekeeping offer far greater accuracy at a fraction of the cost and complexity.