ウィリアム・オートレッド
↑ E.g. William Wynn Westcott, The Rosicrucians, Past and Present, at Home and Abroad, p. 426.
↑ Helena Mary Pycior, Symbols, Impossible Numbers, and Geometric Entanglements: British Algebra Through the Commentaries on Newton's Universal Arithmetick (1997), p. 48.
↑ http://www.maths.ox.ac.uk/about/oxford-figures/ch1-6a
↑ http://www.nmm.ac.uk/collections/explore/index.cfm/category/90107
↑ Dictionary of National Biography, article on Forster.
↑ http://www.hpmuseum.org/sliderul.htm
↑ The slide rule - a forgotten tool Powerhouse Museum Collection
↑ circular slide rule with Oughtred-type sundial reverse Harvard University
↑ http://logica.ugent.be/albrecht/thesis/Etten-intro.pdf