Notes

Selected Works of William Oughtred

A1. William Oughtred, The Circles of Proportion and the Horizontal Instrument (London: Elias Allen, 1632). The "horizontal instrument" is an early version of the sliderule.

A2. Christopher Sangwin, "Oughtred's Circles of Proportion,"  http://web.mat.bham.ac.uk/C.J.Sangwin/Sliderules/circlesproportion.html, (University of Birmingham, accessed 2004 September 6). From John Bravenec, 2004 Sep 9, and E. Tom Kimzey, 2004 Sep 7. This contains some sections of Oughtred's 1632 work, The Circles of Proportion and the Horizontal Instrument.

1. John J. O'Conner and Edmund F. Robertson, "William Oughtred," http://turnbull.dcs.st-and.ac.uk/history/Mathematicians/Oughtred.html (School of Mathematics and Statistics, University of St. Andrews, Scotland, accessed 2003 Sep 13).