Humphry Davy, English chemist

Humphry Davy, English chemist

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Credit: SHEILA TERRY/SCIENCE PHOTO LIBRARY

Caption: Humphry Davy (1778-1829), English chemist. Davy is best known for his invention of the miner's safety lamp, also known as the Davy lamp, for use in coal mines. In 1807 and 1808, Davy discovered the elements potassium, sodium, calcium, barium, magnesium and strontium. Davy is also credited with the concept of allotropes, elements that are physically different due to their structural arrangements. He proposed that diamond was an allotrope of carbon. He also discovered nitrous oxide or laughing gas, which he suggested could be used as an anaesthetic. Engraving by James Thomson, after an 1803 portrait by Henry Howard.

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