Christopher Latham Sholes designed the ubiquitous QWERTY keyboard layout in the early 1870s specifically to separate commonly paired letters and prevent mechanical typewriters from jamming.

Why QWERTY Put Distance Between Some Letters

On a mechanical typewriter, pressing a key did more than mark a letter on paper. It released a slender metal typebar, which swung up to strike an inked ribbon against the page. If another typebar arrived before the first had moved clear, the two could catch against each other. The typist then had to stop and untangle the mechanism.

Sholes’s design problem was therefore partly mechanical: how could a keyboard let people type quickly without sending troublesome combinations of typebars into one another? By moving commonly paired letters apart, the QWERTY arrangement reduced the chance that rapid keystrokes would produce collisions. It traded the apparent simplicity of an alphabetical layout for a pattern shaped by the machine’s moving parts.

A Mechanical Workaround Became a Habit

The layout did not make jams impossible, and its letters were not arranged according to a single principle. It was a practical compromise for a particular kind of machine, where the speed and sequence of keystrokes mattered as much as the typist’s hand movements.

As typewriters spread, people learned the layout and manufacturers built machines around it. Later keyboards no longer needed to manage swinging metal arms, but QWERTY remained familiar. A pattern devised partly to keep typebars from colliding outlasted the mechanism it was designed to accommodate.