Ford Typewriter Ford Typewriter The Ford typewriter was an early prototype typewriter introduced in 1895 by Eugene A. Ford, who later became chief development engineer at IBM (no relation to Henry Ford who founded the Ford Motor Company). It was a commercial failure and only a few were manufactured. Unlike many competing typewriters of this time, it was a forward-striking machine, meaning the hammer struck forward against the paper which was held against the platen roller, instead of up from underneath. This allowed the typist to see the text as it was typed, which was not possible in most other typewriters of
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