History & The Arts
Humphry Davy, laughing gas and the era of self-experimentation
...centre of the laboratory, Davy had set up a chemical reaction: nitrate of ammoniac bubbled in a heated retort, and the escaping gas was being collected in a hydraulic bellows before seeping through water into a reservoir tank from which the sealed box was filled. After an hour and a quarter, by which time he estimated that his system was fully saturated, Davy stepped out...