<P> A medical thermometer is used for measuring human or animal body temperature . The tip of the thermometer is inserted into the mouth under the tongue (oral or sub-lingual temperature), under the armpit (axillary temperature), or into the rectum via the anus (rectal temperature). </P> <P> The medical thermometer began as an instrument more appropriately called a water thermoscope, constructed by Galileo Galilei circa 1592--1593 . It lacked an accurate scale with which to measure temperature and could be affected by changes in atmospheric pressure . </P>

What is the correct method of using a clinical thermometer
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