NCO89941 "Scientific Researches! New Discoveries in PNEUMATICKS! or An Experimental Lecture on the Powers of Air", cartoon of a lecture at the Royal Institution demonstrating the effects of laughing gas (nitrous oxide) pub. by Hannah Humphrey, 1801 (etching) by Gillray, James (1757-1815); 35x24.5 cm; Courtesy of the Warden and Scholars of New College, Oxford; (add.info.: experiment conducted by Dr. Thomas Garnett (1766-1802) on Sir John Coxe Hippisley (1748-1825); Humphry Davy (1778-1814) holding a pair of bellows; Benjamin Thompson, Count Rumford (1753-1814) looking on;); English, out of copyright.