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A variety of rulers A 2 m (6 ft 6 + 3 ⁄ 4 in) carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]
William Oughtred (5 March 1574 – 30 June 1660), [1] also Owtred, Uhtred, etc., was an English mathematician and Anglican clergyman. [2] [3] [4] After John Napier discovered logarithms and Edmund Gunter created the logarithmic scales (lines, or rules) upon which slide rules are based, Oughtred was the first to use two such scales sliding by one another to perform direct multiplication and ...
Anton Ullrich was born on the 30 August 1826 in the small village of Maikammer, Germany. He was the youngest son of an international merchant, Leonhard Ullrich, and his wife Regina Damm. Anton Ullrich worked in his father's store, before founding the "Gebrüder Ullrich" with his younger brother Franz Ullrich. In 1851 Anton Ullrich invented the ...
Slide rule. Typical ten-inch (25 cm) student slide rule (Pickett N902-T simplex trig) A slide rule is a hand -operated mechanical calculator consisting of slidable rulers for evaluating mathematical operations such as multiplication, division, exponents, roots, logarithms, and trigonometry.
William Bedwell (c. 1561 – 5 May 1632 near London) was an English priest and scholar, specializing in Arabic and other "oriental" languages as well as in mathematics. Bedwell was educated at Trinity College, Cambridge. [1] He served the Church of England as Rector of St Ethelburga's Bishopsgate and Vicar of All Hallows, Tottenham (known at ...
The history of logarithms is the story of a correspondence (in modern terms, a group isomorphism) between multiplication on the positive real numbers and addition on the real number line that was formalized in seventeenth century Europe and was widely used to simplify calculation until the advent of the digital computer.
Standard Mandarin. Hanyu Pinyin. Gōngshū Pán. Wade–Giles. Kung-shu P'an. Lu Ban[a] (c. 507 –444 BC) [1][2] was a Chinese architect or master carpenter, structural engineer, and inventor, during the Zhou Dynasty. He is revered as the Chinese Deity (Patron) of builders and contractors.
E6B. The front of a metal E6B. The E6B flight computer is a form of circular slide rule used in aviation. It is an instance of an analog calculating device still being used in the 21st century. An E6B flight computer commonly used by student pilots. They are mostly used in flight training, because these flight computers have been replaced with ...