(1896), following which he began a six-year stint as field geologist with the Canadian International Boundary Commission.ĭaly taught physical geology at the Massachusetts Institute of Technology 1907-1911, then accepted the position of Sturgis-Hooper Professor of Geology at Harvard, which he retained until his retirement in 1942.īaron Marie Charles Théodore de ~ (1768-1846), French astronomer. Reginald Aldworth Canadian geologist (1871-1957) served as an instructor in geology at Harvard (1898-1901), from which he had received his M.A. This work led him to his most important theoretical contribution to chemistry, a scientifically grounded atomic theory of matter. He recorded over 200,000 observations of the atmosphere in his notebooks, and studied mixed gases and the expansion of gases under heat Dalton's Law is still used to describe the law of partial pressures in chemistry. John ~ (1766-1844), British chemist and physicist the first to provide a scientific description of color blindness (1794), a condition from which he suffered and which was long referred to as "Daltonism." Sir Henry Hallett ~ (1875-1968), British physiologist shared the 1936 Nobel Prize in medicine with Otto Loewi (q.v.) "for their discoveries relating to chemical transmission of nerve impulses." Louis ~ (1789-1851), French artist, photographer and chemist developed the pioneering method of photograph processing known as "Daguerreotype." He and Icharus flew from the Labyrinth, but Icharus flew too close to the sun and his wings melted. Daedalus made two pairs of wings from feathers, wax and thread. Minos punished him by imprisoning him and his son, Icharus (q.v.), in the Labyrinth.
Greek mythological character a skilled craftsman and inventor, he helped Minos' daughter elope with Theseus. The galvanometer, which he invented in 1882 for measuring weak electric currents, became the basis for almost all panel-type pointer meters. Among his inventions were dielectric heating and various measuring devices, including the thermocouple ammeter and moving-coil galvanometer, which helped establish the science of electrical engineering. Jacques Arsene ~ (1851-1940), French physicist a pioneer in electrotherapy, he studied the use of high-frequency currents in medical applications. As a graduate assistant at Urania Observatory, Berlin, he was working with Johann Gaul (q.v.) on the night that Neptune was discovered. objects, mainly with an 11-inch refractor. Heinrich Ludwig ~ (1822-1875), German astronomer discovered 342 N.G.C. He also studied physical astronomy, in which he solved the precession of the equinoxes, and was the first to find and solve the wave equation. Jean-le-Rond ~ (1717-1783), French mathematician and astrophysicist a friend of Lagrange (q.v.), he published "d'Alembert's principle" in Traité de Dynamique (1743), which was a powerful new interpretation of Newton's Third Law.
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