Clinical thermometer, Europe, 1851-1900
A normal body temperature is 98.4°F (37°C). It is taken from either the mouth or the rectum. This glass thermometer is gradated in degrees Fahrenheit. Rises in body temperature can indicate fever. Doctors began constructing fever charts in the early 1900s. These recorded the temperature patterns of specific illnesses. The thermometer became an important diagnostic tool. This thermometer has its own rosewood carry case.
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Instruments for measuring temperature by utilizing the variation of the physical properties of substances according to their thermal states..