William Oughred invented which mathematical instrument in 1622?
History of mathematical notation the logarithmic scales (lines, or rules) upon which slide rules are based, it was William Oughtred who used two such scales sliding by one another to perform direct multiplication and division; and he is credited as the inventor of the slide rule in 1622. In 1631 Oughtred introduced the multiplication sign (×) his proportionality sign, and abbreviations "sin" and "cos" for the sine and cosine functions. Albert Girard also used the abbreviations 'sin', 'cos' and 'tan' for the trigonometric functions in his treatise. Johannes Kepler was one of the pioneers of the mathematical applications of infinitesimals. René Descartes is credited
Mathematical instrument Mathematical instrument A mathematical instrument is a tool or device used in the study or practice of mathematics. In geometry, construction of various proofs was done using only a compass and straightedge; arguments in these proofs relied only on idealized properties of these instruments and literal construction was regarded as only an approximation. In applied mathematics, mathematical instruments were used for measuring angles and distances, in astronomy, navigation, surveying and in the measurement of time. Instruments such as the astrolabe, the quadrant, and others were used to measure and accurately record the relative positions and movements of planets and other