1-158-139 - Oxford Science Archive/Heritage Images

Reverse of commemorative medal for Joseph Priestley, English Presbyterian minister and chemist, 1803. Showing his pneumatic trough for collecting gases, and other equipment. Priestley (1733-1804) was a pioneer in the study of gases and is recognised as one of the discoverers of oxygen. He also experimented with electricity. Priestley was a member of the Lunar Society, a dining club of scientists and businessmen from the Birmingham region, including Matthew Boulton, James Watt, John Wilkinson, Erasmus Darwin, and Josiah Wedgwood. In 1794 he emigrated to America and published books on Unitarianism.