”he never intended to make it more difficult to type fast on the QWERTY keyboard (cf. Koichi Yasuoka and Motoko Yasuoka: "On the Prehistory of QWERTY", ZINBUN, No.42 (March 2011), pp.161-174).”
Thursday,May14,2009 " in the 1880s swing up. They are called upstrike typewriters and their typebars never jam.Furthermore,the most frequently-used letter sequence is "th".On QWERTY keyboard,you see T and H are adjacently placed. The second is "er"+"re",also placed in neighborhood of one another.
「CosmopolitanShorthander in1877 condemned Longley it not worth while attempting to use this finger in operating the typewriter. It went on to say that the best operators all used only the first two fingers of each hand and doubted whether a higher speed could be obtained by the use of three.」