Why F and J keyborad have a bumps
The June E Botich invented a underline or bumb on the F and J keys on the keybord.It look like a Braille visualy aided signs. The use of bumb is to locating the keys without looking ithe keys.This keys on the keyboard helps users correctly position their left and right hand on the keyboard without having to look at the keyboard.” -This is the most common explanation given for the reason behind the bumps.
The ridges found on the F and J buttons on a computer keyboard are designed to help users locate the correct keys without looking down.The reason why only these keys have ridges is to help users place their hands in the optimum typing position.With your index fingers on the two ridged keys – your left hand covers A,S, D and F while the right covers J,K,L and colon.
Also found humb on keys on 5. In computer or mobile key pad find the 5 .
Details about the June E Botich is patents.justia.com/inventor/june-e-botich