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As is always said, necessity is the mother of the invention. Man, a long time ago, needed a tool to measure changes in the temperature-especially for the sick. This led to the invention of the thermometer, which according the Mr. Webster is generally a device used in measuring temperature. Though thermometers come today in a variety of designs, most are still designed as a glass bulb attached to a fine tube of glass that contains a sealed in liquid that rises and falls with changes of temperature. They also come with a numbered scale that measures temperature in a quantitative way. Among the most common types of thermometers today are those used for medical purposes called clinical thermometers.