A D V E N T U R E S in C Y B E R S O U N DHumphry Davy, Sir : 1778 - 1829
Chemist, born in Penzance, Cornwall. In 1795 he was apprenticed to a Penzance surgeon, and in 1797 took up chemistry. He investigated the respiration of gases, and discovered the anaesthetic effect of laughing gas. In 1801 he became a lecturer at the Royal Institution. His fame chiefly rests on his discovery that chemical compounds could be decomposed into their elements using electricity. In this way he discovered potassium, sodium, barium, strontium, calcium, and magnesium. In 1815 he invented the miner's safety lamp. In 1812 he was knighted, made a baronet in 1818, and in 1820 became president of the Royal Society.
Humphry Davy was serving as an apothecary's apprentice in Penzance, Cornwall when, in 1798, luck and a knack for chemistry secured him a position at Dr. Thomas Beddoes' Pneumatic Institution in Bristol, an institution dedicated to researching the medical uses of gases. It was there that Davy performed his extensive researches on nitrous oxide and discovered through self-experimentation the delightful sensations from breathing the gas. In the name of science, Davy and his friends (including the poets Coleridge and Southey) monitored the effects of nitrous oxide on themselves and others. These goings on drew attacks from the likes of conservative political writer Edmund Burke who accused the Pneumatic Institution of fomenting atheism and sympathy for the French Revolution. In the meantime Davy managed to write up a thorough account of his researches and thereby secure his reputation as a chemist. In 1801 Davy accepted a post at the newly-established Royal Institution of Great Britain. For twelve years, he lectured to enthusiastic audiences (ladies swooned over the young chemist and some even wrote him poetry), hobnobbed with London's elite, and pursued his chemical researches. In this venue, Davy became one of the most famous chemists in Europe. This fame rested primarily on his work with Volta's pile or electric battery. The pile, which was simply a concatenation of copper and zinc plates separated by a fluid, generated a continuous current of electricity. Volta's announcement of this invention in 1800 took the scientific world by storm. Davy, like his peers all around Europe, set about exploring the uses of the pile and trying to understand how it worked. In 1806 and 1807 Davy presented his most brilliant researches on the pile and his theories of electrochemistry (a term he coined). Through rigorous experiments, he exhibited how the processes of chemical composition and decomposition depend upon electrical states of bodies; he proved that the acids and alkalies that had invariably appeared at the poles of the pile were not somehow generated by electricity but were merely products of contamination; and based on his findings he conjectured that chemical attraction and electricity are "owing to one property of matter and governed by one simple law." Davy became most famous, however, for his discoveries in 1807 of potassium and sodium: he subjected the alkalies potash and soda to the strongest electrical current he could elicit from three connected piles totalling 600 double plates. When small, lustrous globules appeared at the negative pole of the pile, Davy literally danced around the laboratory. Davy then built the world's largest pile (2000 double plates) and used it to discover numerous other elements and to prove that chlorine, as he called it, was an element rather than an acid. Davy married a wealthy widow in 1812 and resigned from the Royal Institution, preferring long Continent trips to the rigors of lecturing and directing the RI lab. On his first Continental tour (1813-15) Davy took along his young lab assistent, Michael Faraday. Some claim this was Davy's greatest discovery of all. Besides his work in electrochemistry Davy invented the miner's safety lamp (1815) and pursued geology, natural history, and agricultural chemistry. Davy was knighted in 1812 and made a baron in 1818; he served as President of the Royal Society from 1820-1827. Davy's science was motivated by questions about life, matter, God, thought, and immortality. He adamantly believed that the highest end of human existence is intellectual achievement and that to intellectually penetrate the secrets of God's universe is the highest achievement of all. (Davy, of course, envisioned himself as singularly advanced in the scale of existence.) Davy wrote poetry all of his life and in his last years he wrote two highly imaginative prose works which debated chemical, zoological, physiological, and geological issues in the search for answers to theological and metaphysical questions.
Humphry Davy (b. Dec. 17, 1778, Penzance, Cornwall, Eng.--d. May 29, 1829, Geneva), English chemist who discovered several chemical elements (including sodium and potassium) and compounds, invented the miner's safety lamp, and became one of the greatest exponents of the scientific method. Early life Davy was the elder son of middle-class parents, who owned an estate in Ludgvan. He was educated at the grammar school in nearby Penzance and, in 1793, at Truro. In 1795, a year after the death of his father, Robert, he was apprenticed to a surgeon and apothecary, and he hoped eventually to qualify in medicine. An exuberant, affectionate, and popular lad, of quick wit and lively imagination, he was fond of composing verses, sketching, making fireworks, fishing, shooting, and collecting minerals. He loved to wander, one pocket filled with fishing tackle and the other with rock specimens; he never lost his intense love of nature and, particularly, of mountain and water scenery. While still a youth, ingenuous and somewhat impetuous, Davy had plans for a volume of poems, but he began the serious study of science in 1797, and these visions "fled before the voice of truth." He was befriended by Davies Giddy (later Gilbert; president of the Royal Society, 1827-30), who offered him the use of his library in Tradea and took him to a chemistry laboratory that was well equipped for that day. There he formed strongly independent views on topics of the moment, such as the nature of heat, light, and electricity and the chemical and physical doctrines of A.-L. Lavoisier. In his small private laboratory, he prepared and inhaled nitrous oxide (laughing gas), in order to test a claim that it was the "principle of contagion," that is, caused diseases. On Gilbert's recommendation, he was appointed (1798) chemical superintendent of the Pneumatic Institution, founded at Clifton to inquire into the possible therapeutic uses of various gases. Davy attacked the problem with characteristic enthusiasm, evincing an outstanding talent for experimental inquiry. He investigated the composition of the oxides and acids of nitrogen, as well as ammonia, and persuaded his scientific and literary friends, including Samuel Taylor Coleridge, Robert Southey, and P.M. Roget, to report the effects of inhaling nitrous oxide. He nearly lost his own life inhaling water gas, a mixture of hydrogen and carbon monoxide sometimes used as fuel. The account of his work, published as Researches, Chemical and Philosophical (1800), immediately established his reputation, and he was invited to lecture at the newly founded Royal Institution of Great Britain in London, where he moved in 1801, with the promise of help from the British-American scientist Sir Benjamin Thompson (Count von Rumford), the British naturalist Sir Joseph Banks, and the English chemist and physicist Henry Cavendish in furthering his researches; e.g., on voltaic cells, early forms of electric batteries. His carefully prepared and rehearsed lectures rapidly became important social functions and added greatly to the prestige of science and the institution. In 1802 he became professor of chemistry. His duties included a special study of tanning: he found catechu, the extract of a tropical plant, as effective as and cheaper than the usual oak extracts, and his published account was long used as a tanner's guide. In 1803 he was admitted a fellow of the Royal Society and an honorary member of the Dublin Society and delivered the first of an annual series of lectures before the board of agriculture. This led to his Elements of Agricultural Chemistry (1813), the only systematic work available for many years. For his researches on voltaic cells, tanning, and mineral analysis, he received the Copley Medal in 1805. He was elected secretary of the Royal Society in 1807. Major discoveries Davy early concluded that the production of electricity in simple electrolytic cells resulted from chemical action and that chemical combination occurred between substances of opposite charge. He therefore reasoned that electrolysis, the interactions of electric currents with chemical compounds, offered the most likely means of decomposing all substances to their elements. These views were explained in 1806 in his lecture "On Some Chemical Agencies of Electricity," for which, despite the fact that England and France were at war, he received the Napoleon Prize from the Institut de France (1807). This work led directly to the isolation of sodium and potassium from their compounds (1807) and of the alkaline-earth metals from theirs (1808). He also discovered boron (by heating borax with potassium), hydrogen telluride, and hydrogen phosphide (phosphine). He showed the correct relation of chlorine to hydrochloric acid and the untenability of the earlier name (oxymuriatic acid) for chlorine; this negated Lavoisier's theory that all acids contained oxygen. He explained the bleaching action of chlorine (through its liberation of oxygen from water) and discovered two of its oxides (1811 and 1815), but his views on the nature of chlorine were disputed. He was not aware that chlorine is a chemical element, and experiments designed to reveal oxygen in chlorine failed. In 1810 and 1811 he lectured to large audiences at Dublin (on agricultural chemistry, the elements of chemical philosophy, geology) and received 1,275 in fees, as well as the honorary degree of LL.D., from Trinity College. In 1812 he was knighted by the Prince Regent (April 8), delivered a farewell lecture to members of the Royal Institution (April 9), and married Jane Apreece, a wealthy widow well known in social and literary circles in England and Scotland (April 11). He also published the first part of the Elements of Chemical Philosophy, which contained much of his own work; his plan was too ambitious, however, and nothing further appeared. Its completion, according to a Swedish chemist, J.J. Berzelius, would have "advanced the science of chemistry a full century." His last important act at the Royal Institution, of which he remained honorary professor, was to interview the young Michael Faraday, later to become one of England's great scientists, who became laboratory assistant there in 1813 and accompanied the Davys on a European tour (1813-15). By permission of Napoleon, he travelled through France, meeting many prominent scientists, and was presented to the empress Marie Louise. With the aid of a small portable laboratory and of various institutions in France and Italy, he investigated the substance "X" (later called iodine), whose properties and similarity to chlorine he quickly discovered; further work on various compounds of iodine and chlorine was done before he reached Rome. He also analyzed many specimens of classical pigments and proved that diamond is a form of carbon. Later years Shortly after his return, he studied, for the Society for Preventing Accidents in Coal Mines, the conditions under which mixtures of firedamp and air explode. This led to the invention of the miner's safety lamp and to subsequent researches on flame, for which he received the Rumford medals (gold and silver) from the Royal Society and, from the northern mine owners, a service of plate (eventually sold to found the Davy Medal). After being created a baronet in 1818, he again went to Italy, inquiring into volcanic action and trying unsuccessfully to find a way of unrolling the papyri found at Herculaneum. In 1820 he became president of the Royal Society, a position he held until 1827. In 1823-25 he was associated with the politician and writer John Wilson Croker in founding the Athenaeum Club, of which he was an original trustee, and with the colonial governor Sir Thomas Stamford Raffles in founding the Zoological Society and in furthering the scheme for zoological gardens in Regent's Park, London (opened in 1828). During this period, he examined magnetic phenomena caused by electricity and electrochemical methods for preventing saltwater corrosion of copper sheathing on ships by means of iron and zinc plates. Though the protective principles were made clear, considerable fouling occurred, and the method's failure greatly vexed him. But he was, as he said, "burned out." His Bakerian lecture for 1826, "On the Relation of Electrical and Chemical Changes," contained his last known thoughts on electrochemistry and earned him the Royal Society's Royal Medal. Davy's health was by then failing rapidly; in 1827 he departed for Europe and, in the summer, was forced to resign the presidency of the Royal Society, being succeeded by Davies Gilbert. Having to forgo business and field sports, Davy wrote Salmonia: or Days of Fly Fishing (1828), a book on fishing (after the manner of Izaak Walton) that contained engravings from his own drawings. After a last, short visit to England, he returned to Italy, settling at Rome in February 1829--"a ruin amongst ruins." Though partly paralyzed through stroke, he spent his last months writing a series of dialogues, published posthumously as Consolations in Travel, or the Last Days of a Philosopher (1830). (F.W.G.) BIBLIOGRAPHY J.A. Paris, The Life of Sir Humphry Davy (1831), for more than a century the standard work on Davy's life; Sir H. Hartley, Humphry Davy (1966), an extremely useful account of Davy's life that complements Paris' biography but with changed emphases resulting from the passage of 135 years.
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