Humphry Davy

Humphry Davy was born on December 17, 1778, in Penzance, a market town near the western tip of Cornwall. His father, Robert Davy, was a woodcarver who farmed a small property at Varfell and left the family in debt when he died in 1794. His mother, Grace Millett Davy, took in lodgers and ran a millinery business to keep her five children fed, and Humphry, the eldest, grew up conscious that he would have to make his own way ^[1].

His schooling was ordinary. He attended the grammar schools at Penzance and Truro, where masters remembered him more for storytelling and verse than for scholarship. Cornwall itself supplied a different sort of education: the county's tin and copper mines made practical chemistry and mineralogy part of local conversation, and the boy fished, shot, and roamed the coast with an appetite for observation that never left him ^[2].

After his father's death, sixteen-year-old Davy was apprenticed to John Bingham Borlase, a surgeon and apothecary in Penzance. The apprenticeship was meant to lead to medicine, but the dispensary gave him chemicals and idle hours, and around 1797 he began teaching himself chemistry from Antoine Lavoisier's Traité élémentaire de chimie and William Nicholson's dictionary. Within a year he was conducting his own experiments on heat and light, questioning received ideas with a confidence that impressed visitors, among them Davies Giddy (later Davies Gilbert), a Cornish gentleman scientist who opened doors for him ^[1].

Giddy's introductions changed everything. In 1798 the physician Thomas Beddoes hired the nineteen-year-old as superintendent of his Pneumatic Institution in Bristol, a clinic founded to test whether newly discovered gases could treat disease. It was a remarkable post for someone with no degree, and Davy threw himself into it with reckless energy, inhaling experimental gases himself and nearly dying after breathing carbon monoxide ^[2].

His Bristol years produced the work that first made him famous. In 1800 he published Researches, Chemical and Philosophical, a detailed study of nitrous oxide. Davy described the gas's intoxicating effects, coined observations about the pleasure it produced (it soon acquired the name laughing gas), and noted that it might be used to dull pain during surgical operations, a suggestion that lay ignored for over four decades until dentists took it up in the 1840s ^[3]. In Bristol he also befriended the poets Samuel Taylor Coleridge and Robert Southey, who joined his gas experiments and admired his literary flair; Davy wrote poetry throughout his life and helped see Wordsworth and Coleridge's Lyrical Ballads through the press ^[2].

In 1801 Count Rumford recruited him to the newly founded Royal Institution in London, first as assistant lecturer, then within a year as professor of chemistry. Davy turned out to be a phenomenon on the lecture platform. His demonstrations drew fashionable crowds to Albemarle Street, women as well as men, and ticket income from his lectures helped keep the young institution solvent. At twenty-three he was already among the best known scientific figures in Britain ^[1].

Any account of Humphry Davy achievements begins with electrochemistry. Alessandro Volta's pile, announced in 1800, gave chemists a steady electric current for the first time, and Davy saw sooner than most that electricity could tear compounds apart. In his 1806 Bakerian Lecture to the Royal Society he set out the relationship between electrical and chemical forces, work so admired that the Institut de France awarded him a prize established by Napoleon even though Britain and France were at war ^[4].

The next two years brought a run of discoveries with few parallels in the history of chemistry. In October 1807 Davy passed current through molten caustic potash and watched metallic globules form: he had isolated potassium, the first new metal won by electrolysis. Days later he obtained sodium from caustic soda by the same method. In 1808, working with a larger battery, he isolated or helped characterize calcium, barium, strontium, magnesium, and boron ^[4]. He then turned to the green gas that Carl Wilhelm Scheele had prepared in 1774. French chemists, following Lavoisier, held that it must contain oxygen. Davy's experiments of 1810 convinced him it was a simple substance, an element in its own right, and he named it chlorine for its color. He later argued from studies of muriatic acid that hydrogen, not oxygen, was the true source of acidity, overturning a central plank of Lavoisier's system ^[5].

His most celebrated invention answered a humanitarian emergency. After an explosion at the Felling colliery near Gateshead killed 92 miners in 1812, mine owners and clergy asked men of science for help against firedamp, the methane that ignited at the touch of a candle. In 1815 Davy showed that flame would not pass through fine iron gauze, and he designed a lamp whose flame was enclosed in a gauze cylinder. The Davy lamp let miners work in gassy seams, and its flame even served as a crude gas detector. George Stephenson devised a similar lamp independently in the same months, and priority was disputed, but Davy refused to patent his design, saying his reward was the service to humanity. The Royal Society had already given him its Copley Medal in 1805; grateful coal owners presented him with a service of plate ^[6].

One further contribution outweighed all the rest in its consequences. In 1813 Davy engaged Michael Faraday, a bookbinder's apprentice who had attended his lectures, as a laboratory assistant at the Royal Institution. Faraday accompanied Davy and his wife on a European tour from 1813 to 1815 and went on to discover electromagnetic induction. Davy's role in launching that career is often called his greatest discovery, though relations between the two men later soured when Davy opposed Faraday's election to the Royal Society ^[7].

Davy was knighted by the Prince Regent in April 1812, and three days later he married Jane Apreece, a wealthy Scottish widow prominent in Edinburgh literary society and a cousin by marriage of Sir Walter Scott. The match brought him financial independence and social standing, but it was not a happy one. The couple had no children, quarreled often, and spent long periods apart, particularly in Davy's final decade ^[1].

He cut an unusual figure among men of science: short, animated, vain about his celebrity, and genuinely gifted as a writer. He filled notebooks with poetry from boyhood onward, and Coleridge once remarked that if Davy had not been the first chemist of his age he might have been its finest poet. Fishing was his lifelong passion, and his book Salmonia, or Days of Fly Fishing, published in 1828, mixed angling instruction with philosophical dialogue in the manner of Izaak Walton ^[2].

In 1818 the Crown made him a baronet, at that time the highest honor the British state had granted a scientist for scientific work. Contemporaries found him a mixture of brilliance and prickliness, generous in his enthusiasms yet jealous of rivals, a man who had risen fast from modest origins and never quite stopped guarding what he had won ^[1].

In 1820 Davy was elected president of the Royal Society, succeeding the long-serving Sir Joseph Banks. He held the chair for seven years and pushed the society toward higher scientific standards, backing projects such as Charles Babbage's calculating engine, but his presidency was stormy. His temper, his handling of the Faraday election in 1824, and disputes over reform of the society left him with as many critics as allies ^[1].

His last major applied project was troubled too. The Admiralty asked him to solve the corrosion of copper sheathing on warship hulls, and in 1824 he proposed attaching blocks of zinc or iron as sacrificial protectors. The electrochemistry was sound, and the method anticipated modern cathodic protection, but the protected copper fouled rapidly with weeds and barnacles, and the Navy abandoned the scheme. The episode embarrassed him publicly at a time when his health was already failing ^[5].

Davy suffered a stroke in 1826, resigned the presidency of the Royal Society the following year, and left England to travel through Italy and the Alps in search of recovery. He fished, shot, and wrote his final book, Consolations in Travel, a series of dialogues on science, religion, and the fate of civilizations, published after his death. A second stroke struck him at Rome early in 1829. He reached Geneva on May 28 and died there the next morning, May 29, 1829, at the age of fifty. He was buried in the Plainpalais cemetery in Geneva ^[8].

Anyone asking who was Humphry Davy will find his name written across the map of chemistry. He added more elements to the known list than almost any other single investigator, demonstrated that electricity could serve as a chemical instrument, and reframed the theory of acids. The Royal Society honored him in 1877 by founding the Davy Medal, still awarded annually for outstanding work in chemistry; its first recipients were Robert Bunsen and Gustav Kirchhoff ^[4].

The safety lamp kept his name alive among working people long after his theoretical papers were absorbed into textbooks. Miners called their gauze lamps Davys well into the twentieth century, and the invention is still cited as an early model of science applied directly to industrial safety. In Penzance a statue of Davy holding his lamp stands at the top of Market Jew Street, outside the granite Market House of his home town ^[6].

Historians of science have also come to read Davy as a transitional figure: a self-taught provincial who made science glamorous, a poet among chemists whose lectures turned the Royal Institution into a public stage, and a mentor (however grudging) of the man who surpassed him. Biographers from John Ayrton Paris in 1831 to recent scholars have traced how his fame shaped the very idea of the public scientist in Britain. Among the durable Humphry Davy facts is a simple one: a lunar crater carries his name, a small marker of how far the woodcarver's son from Cornwall traveled ^[2].