Engraving by George Vertue of the Reverend William Whiston (1667-1752). Also illustrated are Norman's dipping needle and Whiston's version. The dipping needle was an instrument which was used to determine latitude and longitude. A clergyman and mathematician, Whiston succeeded Sir Isaac Newton (1643-1727) as Lucasian Profesor at Cambridge in 1703, but was expelled from the University in 1710 for Arianism, a doctrine which refused to believe in the divinity of Christ.
© Science Museum / Science & Society Picture Library