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Galiloe is a great philosopher who extended our knowledge of nature. He constructed thermometer in 1602. He first employed water as the agent.

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Like many other philosophers who have greatly extended our knowledge of nature, Galileo had a remarkable attitude for the invention of instruments designed for philosophical research To facilitate his practical work. We find that in 1599 he had engaged a skilled workmen who was to live in his house, and we constantly at hand to try the devices which were for a was bringing from Galileo's fertile brain. Among the earliest of his inventions appears to have been the thermometer, which he constructed in 16. Not to no doubt this apparatus, in its primitive form differed in some respect from the contra vince we called by the same name Galileo at first employed water as the agent. Its expansion was the basis of the measure of temperature.