William Jones, FRS was a Welsh mathematician best known for his use of the symbol π to represent the ratio of the circumference of a circle to its diameter. He was a close friend of Sir Isaac Newton a
Portrait by William Hogarth, 1740
Jones' usage of π
Isaac Newton
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Sir Isaac Newton was an English polymath who was a mathematician, physicist, astronomer, alchemist, theologian, author and inventor. He was a key figure in the Scientific Revolution and the Enlightenm
William Jones (mathematician)
…for his use of the symbol π (the Greek letter Pi) to represent the ratio of the circumference of a circle to its diameter. He was a close friend of Sir Isaac Newton and Sir Edmund Halley. In November 1711, Jones became a fellow of the Royal Society, and later served as the Royal Society's vice-president. William…
Portrait of Isaac Newton, 1689
Some of the figures added by Isaac Newton in his 1672 and 1681 editions of the Geographia Generalis. These figures appeared in subsequent editions as well.
Newton in 1702 by Godfrey Kneller
A replica of the reflecting telescope Newton presented to the Royal Society in 1672 (the first one he made in 1668 was loaned to an instrument maker but there is no further record of what happened to it).