Sir Humphry Davy, (1778-1829) was a English chemist and inventor. He was educated in Truro and then apprenticed to a Penzance surgeon. In 1797 he took up chemistry and was taken on by Thomas Beddoes, as an assistant at his Medical Pneumatic Institution in Bristol. Here he experimented with various new gases and discovered the anesthetic effect of laughing gas (nitrous oxide). He became a famous and well paid lecturer. Hius celebrated public demonstrations of the effects of laughing gas are lampooned in this etching from 1802.