An old man rests his head on his hand; cherubs play in a room filled with mechanical instruments; representing mechanical philosophy (or 18th century physics). Stipple engraving by J. Chapman, 1816.

Licence: Public Domain Mark

Credit: An old man rests his head on his hand; cherubs play in a room filled with mechanical instruments; representing mechanical philosophy (or 18th century physics). Stipple engraving by J. Chapman, 1816. Wellcome Collection. Source: Wellcome Collection.