Sholes and Glidden typewriter length. The redesigned platen also introduced the modern spacing functionality (horizontal and axial movement providing letter and line spacing, respectively). The cylindrical platen became "an indispensable part of every standard [typewriter]". By the end of 1872, the appearance and function of the typewriter had assumed the form that would become standard in the industry and remain largely unchanged for the next century. Although the machine possessed a cylindrical platen and what was essentially a QWERTY keyboard, two design elements that would later become essential were lacking: the ability to write in upper and lowercase letters and "visible" print. Although the
A. Clyde Roller A. Clyde Roller Archibald Clyde Roller (October 13, 1914 – October 16, 2005) was an American music professor, conductor, and oboist. Roller, a native of Rogersville, Missouri, received his musical education at the Eastman School of Music, graduating in 1941. Roller was the principal oboist with several orchestras: the Oklahoma City Symphony from 1937 to 1939, the Birmingham (Alabama) Symphony from 1940 to 1942, and the Tulsa Philharmonic. He conducted Dallas's Southern Methodist University Orchestra from 1947 to 1948, and from 1948 to 1962 was music director of the Amarillo Symphony Orchestra. He also guest conducted the Boston Symphony Orchestra: