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English clergyman, natural philosopher and scientist

William Derham FRS (26 November 16575 April 1735) was an English clergyman, natural theologian, natural philosopher and scientist. He produced the earliest reasonably accurate measurement of the speed of sound.

William Derham was the son of Thomas Derham. He was born at Stoulton, in Worcestershire, England. He was educated at Blockley, Gloucestershire, and at Trinity College, Oxford, from 1675 to 1679.

In 1696, he published his Artificial Clockmaker, which went through several editions. The best known of his subsequent works are Physico Theology, published in 1713; Astro Theology, 1714; and Christo Theology, 1730. All three of these books are teleological arguments for the being and attributes of God, and were used by William Paley nearly a century later. However, these books also include quantities of original scientific observations. For example, Physico Theology contains his recognition of natural variation within species and that he knew that Didelphis virginialis (the Virginia opossum) was the only marsupial in North America. It also includes one of the earliest theoretical descriptions of a marine chronometer, accompanied by a discussion of the use of vacuum seals to reduce inaccuracies in the operation of timepieces. He is the first person known to have used the word chronometer. Similarly, Astro Theology includes several newly identified nebulae (this was the name used at the time for all extended astronomical objects: some of his nebulae are what we would now call star clusters). His 16 feet (5 m) telescope (also used when measuring the velocity of sound) was at the top of the tower of St Laurence's Church, where the necessary doors are still in place. He edited Eleazar Albin's Natural History, and published some of the manuscripts of the scientist Robert Hooke. Derham used a telescope from the tower of the church of St Laurence, Upminster, to observe the flash of a distant shotgun being fired, and then measured the time until he heard the gunshot with a half second pendulum. Measurements were made of gunshots from local landmarks including the Church of St Mary Magdalene, North Ockendon. The distance was known by triangulation, and thus the speed that the sound had travelled could be calculated.