Sholes and Glidden typewriter seeking to diversify, Remington further refined the typewriter before finally placing it on the market on July 1, 1874. During its development, the typewriter evolved from a crude curiosity into a practical device, the basic form of which became the industry standard. The machine incorporated elements which became fundamental to typewriter design, including a cylindrical platen and a four-rowed QWERTY keyboard. Several design deficiencies remained, however. The Sholes and Glidden could print only upper-case letters—an issue remedied in its successor, the Remington No. 2—and was a "blind writer", meaning the typist could not see what was being written as it
Cylindrical harmonics Cylindrical harmonics In mathematics, the cylindrical harmonics are a set of linearly independent solutions to Laplace's differential equation, formula_1, expressed in cylindrical coordinates, "ρ" (radial coordinate), "φ" (polar angle), and "z" (height). Each function "V"("k") is the product of three terms, each depending on one coordinate alone. The "ρ"-dependent term is given by Bessel functions (which occasionally are also called cylindrical harmonics). Each function formula_2 of this basis consists of the product of three functions: where formula_4 are the cylindrical coordinates, and "n" and "k" are constants which distinguish the members of the set from each other. As a result