How machines learned precision

In the late 18th century, the Industrial Revolution demanded unprecedented precision in manufacturing, particularly for steam engine cylinders and screws, yet workshops lacked both the machinery and measurement tools to achieve it. James Watt's steam engine design required perfectly round and straight cylinder bores to function efficiently, a challenge that traditional hand-filing methods could not solve. By the mid-1800s, innovations in machine design and metrology—culminating in Joseph Whitworth's ability to measure differences of a millionth of an inch—enabled manufacturers to achieve the precision necessary for reliable industrial machinery.