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Galileo Galilei builds a crude thermometer using the contraction of air to draw water up a tube. Galileo devised a piece of apparatus he named the thermoscope to measure hot and cold. The device consisted of a glass bottle about the size of an egg, with a long glass neck. This bottle was heated with the hands and then immersed partially in a vessel containing a liquid. When the hands were removed from the bottle, the liquid rose to a certain height in the neck, remaining above the level of the liquid in the vessel. A similar instrument was devised by Santorio in Venice in 1612 and when Galileo was informed of the similar instrument he protested and seems to have suspected that someone wanted to rob him of the glory of the discovery.
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