An old lady in a pharmacy misunderstanding the use of a thermometer: she thinks the ambient temperature will adjust to match a setting on the thermometer, rather than vice versa. Wood engraving after C. Keene, 1887.

Licence: Public Domain Mark

Credit: An old lady in a pharmacy misunderstanding the use of a thermometer: she thinks the ambient temperature will adjust to match a setting on the thermometer, rather than vice versa. Wood engraving after C. Keene, 1887. Wellcome Collection. Source: Wellcome Collection.