A Study of the Two-letter Sequences in Written English Used as a Basis for an Estimate of the Efficiencies of the Universal Typewriter Keyboard and of a Suggested Revision
University of Wisconsin--Madison, 1930 - 182 pages
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22 Once ae-ea APPEAR IN COMBINATION banks 60 binations chart column common words Comparative Statement Coover counted Diagram direct and reverse double letters Eldridge list Eldridge material Estimated Efficiency expert typists forefinger Fourth Finger frequencies Herkimer County ho-oh Horn important combinations input key sequences KEYBOARD Efficiency lB t H Left Hand LETTER COMBINATIONS BELONGING letter keys letter sequences Letters Typed NUMBER OF LETTER number of opposite number of sequences one-hand sequences Opposite Hand opposite sequences original summary sheet ou-uo output percent Principal Combining purely consonant combinations quences rank reach sequence reverse sequences REVISED KEYBOARD Right Hand Rock and Trill rock sequence rt-tr scores second stroke Sholes shows space SUGGESTED REVISION Table VII tabulated tally sheet tapping third total number Trill Sequences Twice 14 Twice 26 Twice Once two-letter sequences typewriter keyboard typing sequences word list words occurring