Mercury-in-glass thermometer related to the rapid cooling (and contraction) of the glass. When Celsius decided to use his own temperature scale, he originally defined his scale "upside-down", i.e. he chose to set the boiling point of pure water at 0 °C (212 °F) and the freezing point at -100 °C (-32 °F). One year later, Frenchman Jean-Pierre Christin proposed to invert the scale with the freezing point at and the boiling point at . He named it Centigrade (100 grades). Finally, Celsius proposed a method of calibrating a thermometer: These points are adequate for approximate calibration but both vary with atmospheric pressure.
Gabriel Daniel Gabriel Daniel Gabriel Daniel (8 February 1649 – 23 June 1728) was a French Jesuit historian. Born in Rouen, he was educated by the Jesuits, entered the order at the age of eighteen, and became superior at Paris. He is best known by his "Histoire de France depuis l'établissement de la monarchie française" (first complete edition, 1713), which was republished in 1720, 1721, 1725, 1742, and (the last edition, with notes by Henri Griffet) 1755–1760. Daniel published an abridgment in 1724 (English trans., 1726), and another abridgment was published by Dorival in 1751. Though full of prejudices which affect his