Thomas Edison had done in his 1872 patent for an electric print-wheel device which later became the basis for teletype machines. Lucien Stephen Crandall, the inventor of the second type- writer to reach the American market (in 1879) arranged the type on a cylindrical sleeve: the sleeve was made to revolve to the required letter and come down onto the printing-point, locking in place for correct alignment. (So much for the "revolutionary" character of the IBM 72/82's "golf ball" design.
competing visions for the typewriter