Sir Humphry. 1778–1829, English chemist who isolated sodium, magnesium, chlorine, and other elements and suggested the electrical nature of chemical combination. He invented the Davy lamp See Davy lamp
(dā'vē) British chemist who was a pioneer of electrochemistry. By means of electrolysis Davy isolated several elements, including sodium and potassium (1807), and barium, boron, calcium, and magnesium (1808). He also proved that diamonds are a form of carbon.