Editing QWERTY (section)

===Contemporaneous alternatives===
[[File:Crandall 1, 1883.jpg|thumb|Crandall 1, 1883]]
There were no particular technological requirements for the QWERTY layout,<ref name="Yasuoka2011" /> since at the time there were ways to make a typewriter without the "up-stroke" typebar mechanism that had required it to be devised. Not only were there rival machines with "down-stroke" and "front stroke" positions that gave a visible printing point, the problem of typebar clashes could be circumvented completely: examples include [[Thomas Edison]]'s 1872 electric print-wheel device which later became the basis for [[Teleprinter|Teletype]] machines; [[Lucien Stephen Crandall]]'s typewriter (the second to come onto the American market in 1883) whose type was arranged on a cylindrical sleeve; the [[Hammond Typewriter|Hammond typewriter]] of 1885 which used a semi-circular "type-shuttle" of hardened rubber (later light metal); and the [[Blickensderfer typewriter]] of 1893 which used a type wheel. The early Blickensderfer's "Ideal" keyboard was also non-QWERTY, instead having the sequence "DHIATENSOR" in the [[home row]], these 10 letters being capable of composing 70% of the words in the English language.<ref>{{cite book|last=Shermer|first=Michael|title=The mind of the market|year=2008|publisher=Macmillan|isbn=978-0-8050-7832-9|page=[https://archive.org/details/mindofmarketcomp00sher/page/50 50]|url-access=registration|url=https://archive.org/details/mindofmarketcomp00sher/page/50}}</ref>