- William Oughtred 575and Thomas Harriot (1560-1621).
- The vertical line was printed by Oughtred and some of Briggs's successors.
- WILLIAM OUGHTRED (fl.
- William Oughtred, a contemporary of Harriot, published an algebra, Clavis mathematicae, simultaneously with Harriot's treatise.
- Oughtred, from whom the relation of this matter came."