In 1654, Ferdinando II de Medici crafted first thermometer by by used seal tube partially filled with alcohol and a reservoir bulb, thereby eliminating the interference of barometric pressure common inprevious models.
Daniel Gabriel Fahrenheit produced a thermometer by using mercury in 1724 and established the fahrenheit scale. Because of mercury's high coeffecient of expansion, the results were highly reproducble. Eightteen years later, Arders Celsius proposed that a scles of zero degrees (melting point of water) to 100 degrees (boiling point) was more practical. Both scales are still used today, as is the original mercury sealed-glass thermometer.
Dr James Currie popularized the use of these glass thermometer for the measurement of patient temperatuer towards the end of the 18th century. He pratised in Liverpool from 1780 to 1805, published his findings and theories, and corresponded with the leading scientists of the day.
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