# Edmund Gunter facts for kids

Kids Encyclopedia Facts
(Redirected from Gunter's chain)

Edmund Gunter (1581 – 10 December 1626) was an English clergyman, mathematician, geometer and astronomer of Welsh descent.

He is best remembered for his practical inventions for measurement. These include the Gunter's chain, Gunter's quadrant, and the Gunter's scale. In 1620, he invented the first successful analogue device which he developed to calculate logarithmic tangents. These inventions are related to the main practical maths interests of England at that time. These were maritime navigation, land surveying and accounting.

Gunter was taught mathematics by Henry Briggs. He became a Gresham Professor of Astronomy, from 1619 until his death. Gunter invented the terms cosine and cotangent,

## Gunter's scale

William Oughtred (1575–1660), inventor of the slide rule, used Gunter's scale as his starting-point

Gunter’s scale (called by seamen "the Gunter") is a large plane scale, usually 2 ft. long by about 1½ in. broad, and engraved with various lines of numbers. By means of this scale questions in navigation, trigonometry etc. are solved with the aid of a pair of compasses.

The slide rule was invented around 1620–1630, shortly after John Napier's publication of the concept of the logarithm. In 1620 Gunter developed his calculating device with a single logarithmic scale. With additional measuring tools it could be used to multiply and divide. In c. 1622, William Oughtred of Cambridge combined two handheld Gunter rules to make a device that is the modern slide rule.

## Gunter's chain

Gunter's chain was in common use in surveying up to modern times. It is 22 yards long and is divided into 100 links. Its usefulness comes from its decimal division, and the fact that 10 square chains make an acre. It folds up in sections, and is carried by the surveyor.