Daniel Gabriel Fahrenheit, Polish-German physicist and engineer, developed the Fahrenheit scale (died 1736)

Daniel Gabriel Fahrenheit FRS was a physicist, inventor, and scientific instrument maker. He was born in Poland to a family of German origin, although he spent much of his life in the Dutch Republic. Fahrenheit significantly improved the design and manufacture of thermometers; his were accurate and consistent enough that different observers, each with their own Fahrenheit thermometers, could reliably compare temperature measurements with each other. Fahrenheit is also credited with producing the first successful mercury-in-glass thermometers, which were more accurate than the spirit-filled thermometers of his time and of a generally superior design. The popularity of his thermometers also led to the widespread adoption of his Fahrenheit scale, with which they were provided.