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Gunter, Edmund


Mathematician and astronomer, born in Hertfordshire, SE England, UK. He studied at Oxford, became professor of astronomy in Gresham College, London, and invented many measuring instruments that bear his name; Gunter's chain, the 22-yard-long, 100-link chain used by surveyors; Gunter's line, the forerunner of the modern slide-rule; Gunter's scale, a two-foot rule with scales of chords, tangents and logarithmic lines for solving navigational problems; and the portable Gunter's quadrant. He made the first observation of the variation of the magnetic compass, and introduced the words cosine and cotangent into the language of trigonometry.

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AND Reference Data Ltd.,Oxford, UK.

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