Why do some keys have tubercles?

Keyboard - a platform with keys designed for typing on a PC. Ever since the time of its predecessor - a typewriter - some buttons were supplied with bulges, protrusions. You probably met them, you can even look at your keyboard now to find them. And these small details are not accidental, they play a role.

What is the key on the key for?

According to industry standards, each keyboard should be provided with a bulge in the form of a sticking up rectangle. This applies not only to computer control units, but also to keys for a push-button telephone. An exception may be rare gaming devices.

Despite their small size, these small details play a huge role. Those who work more often with typing might notice that the letters on the board are arranged randomly, but when typing, the fingers are mostly in the center, occasionally distracted by the periphery. In the middle are the most used letters, and the farther the symbol from the letters P and P, the less its popularity.

Reference! This arrangement was used on typewriters to preserve the resource of levers for buttons that are used less often. In modern times, the position of letters is preserved, first of all, to maintain convenience.

The tubercles help to find the center without using the eyes. If a person types while looking at the keyboard, then o will not see what is happening on the screen and will not notice any mistakes - and there will be errors if the speed of pressing the buttons is acceptable, because no one is safe from accidental finger hits on neighboring buttons. If you print, constantly looking from the monitor to the buttons and back (the most popular way now), then this will create some insurance, however, the speed may be insufficient.

Printing "blindly" means transferring all the attention to what is happening on the screen, while the fingers themselves, thanks to the memory remaining in the cerebellum, type the text. And then the tubercles begin to show themselves. To the touch, all buttons are the same (unless, of course, a person specifically made a unique roughness for each of them), except for two buttons located in the center. The tubercles on them serve as the only guideline for printing blindly.

Blind print speed is almost unlimited. 300 characters per minute (5 per second) is considered a very good result, provided that the person specially prepared using this method. The world record - 940 words per minute - belongs to Mikhail Shestov. If you train your fingers to find a landmark on your own, then even if they are "lost" in touch typing, they will automatically return to the center, feel for the tubercles and continue typing. Conscious action takes much more time. The protrusions on the keys seem like an insignificant detail, although they play a huge role.

Which buttons have such tubercles?

According to standards, on the keyboard for a computer, the tubercles are located on the keys A (F) and O (J), as well as the number 5 on the right side (NumPad).

Button telephones, in view of the small number of buttons, have only one reference point - the number 5. In most cases, these are two protrusions on the sides of the five, but sometimes there are models with a long rectangle located at the bottom of the button.