The inventor, C. L. Sholes, put together the first typewriter prototyp. It had its letters on the end of rods called “typebars”. The typebars hung in a circle. The roller which held the paper sat over this circle, and when a key was pressed, a typebar would swing up to hit the paper from underneath. If two typebars were near each other in the circle, they would tend to clash into each other when typed in succession. So, Sholes figured he had to take the most common letter pairs such as “TH” and make sure their typebars hung at safe distances.

He did this using a study of letter-pair frequency prepared by educator Amos Densmore, brother of James Densmore, who was Sholes’ chief financial backer. The QWERTY keyboard itself was determined by the existing mechanical linkages of the typebars inside the machine to the keys on the outside. Sholes’ solution did not eliminate the problem completely, but it was greatly reduced.

Qwerty became common on typewriters and computer manufacturers decided to port the existing keyboard layout to computers so that typewriter users were able to accommodate quickly. Experimental keyboards have been released in the meantime that would optimize the typing speed and workflow due to a more natural design, but they never were commercially successful. Wonder why the letters are displayed the way they are on today’s keyboards?

Dvorak went beyond Blickensderfer in arranging his letters according to frequency. Dvorak’s home row uses all five vowels and the five most common consonants: AOEUIDHTNS. With the vowels on one side and consonants on the other, a rough typing rhythm would be established as each hand would tend to alternate.

With the Dvorak keyboard, a typist can type about 400 of the English language’s most common words without ever leaving the home row. The comparable figure on QWERTY is 100. The home row letters on Dvorak do a total of 70% of the work. On QWERTY they do only 32%.

That’s why.