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Davy

Davy was a British chemist best known for his experiments in electro-chemistry and his invention of a miner's safety lamp.

Born 17th December 1778 in Penzance.

Died 29th May 1829 in Switzerland.

He was apprenticed to a surgeon and aged 19 went to Bristol to study science. There he investigated gases. He prepared and inhaled nitrous oxide (laughing gas) and in 1800 published the results of his work in 'Researches, Chemical and Philosophical'. This made his reputation and the following year he was hired as an assistant lecturer in chemistry at the Royal Institution. There he was a great success, with his lectures soon becoming a draw for fashionable London society. He became a fellow of the Royal Society in 1803 and was awarded its Copley Medal in 1805.

In 1800, the Italian scientist Alessandro Volta had introduced the first battery. Davy used this for what is now called electrolysis and was able to isolate a series of substances for the first time - potassium and sodium in 1807 and calcium, strontium, barium and magnesium the following year. He also studied the forces involved in these separations, inventing the new field of electrochemistry.

Davy was now considered one of Britain's leading scientists and was knighted in 1812. In 1813, Davy set off on a two year trip to Europe. He visited Paris - even though Britain and France were at war - where he collected a medal awarded to him by Napoleon, and identified the element iodine for the first time.

In 1815, he received a letter from some Newcastle miners which told of the dangers they faced from methane gas. The gas often filled the mines, and could be sparked off by the candles they had in their helmets to light their work. The resulting fires and explosions caused many deaths. Davy separated the flame from the gas, and his 'Davy' lamp later became widely used. The same year George Stephenson, the railway engineer, also invented a safety lamp.

 

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