Keyboard layout 10 includes its own implementation of a mnemonic QWERTY-based input method for Russian, which does not fully rely on assigning a key to every Russian letter, but uses the sh, sc, ch, ya (ja), yu (ju), ye (je), yo (jo) combinations to input ш, щ, ч, я, ю, э, and ё respectively. Virtual (on-screen) Russian keyboards allow entering Cyrillic directly in a browser without activating the system layout. This virtual keyboard offers YaZhERT (яжерт) variant. Another virtual keyboard supports both traditional ("MS Windows" and Typewriter) and some phonetic keyboard layouts, including AATSEEL "Student", Mac OS X Phonetic Russian layout and
QWERTY Edison's 1872 electric print-wheel device which later became the basis for Teletype machines; Lucien Stephen Crandall's typewriter (the second to come onto the American market) whose type was arranged on a cylindrical sleeve; the Hammond typewriter of 1887 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. Alternating hands while typing is a desirable trait