See main: Fire wheelIn 1699, Amontons published his experimental work in thermometry and on the development of the ideal gas laws and research into the nature of cold, which were said to have been repercussions of his failed attempt to create a ‘fire wheel’ that used the heat of a fire to expand air and make it move a wheel. The device was described as a very ingenious mill wheel, moved by the action of fire, based on a large number of experiments, and on arguments, which he called a moulin à feu (mill of fire). Some of his fire wheel research was used to create better thermometers. [1]
A picture of Amontons' 1699 constant-volume air thermometer. [7] |
See main: Amontons gas law; See also: Gas lawsIn 1699, Amontons, built his so-called "constant volume air thermometer", shown adjacent, consisting U-shaped tube ending in a bulb, filled with mercury, the long end of the tube being 45 inches, the height of the long arm being the measure of the "spring" which the air, in the region above the mercury in the big bulb, had obtained.
“Uneven masses of air loaded with equal or equal weights also increased the force of their spring by equal degrees of heat.”— Guillaume Amontons (1702), Publication [7]
“The same degree of heat, however small it may be, can always increase the spring force of the air more and more, if this air is always loaded with a greater and greater weight.”— Guillaume Amontons (1702), Publication [7]
“The law connecting pressure and temperature at constant volume has been referred to as ‘Amontons law’.”— W.S. James (1929), “The Discovery of the Gas Laws. II. Gay-Lussac’s Law” [7]
“It appears that the ‘extreme cold’ [absolute zero] of this thermometer is that which would reduce the air by its ‘spring’, to sustain no load at all.”— Guillaume Amontons (1703), Publication [7]
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“I read that the celebrated Amontons, using a thermometer of his own invention, had discovered that water boils at a fixed degree of heat. I was at once inflamed with a great desire to make for myself a thermometer of the same sort, so that I might with my own eyes perceive this beautiful phenomenon of nature.”— Daniel Fahrenheit (1724), “Experiments and Observations Concerning the Congealment of Water in a Vacuum” [6]
“The question whether there is a limit to the degree of cold possible, and, if so, where the zero must be placed, was first attacked by the French physicist, G. Amontons, in 1702–1703, in connexon with his improvements in the air-thermometer. In his instrument temperatures were indicated by the height at which a column of mercury was sustained by a certain mass of air, the volume or “spring” of which of course varied with the heat to which it was exposed. Amontons therefore argued that the zero of his thermometer would be that temperature at which the spring of the air in it was reduced to nothing. On the scale he used the boiling-point of water was marked at 73 and the melting-point of ice at 51½, so that the zero of his scale was equivalent to about –240° on the centigrade scale. This remarkably close approximation to the modern value of –273° for the zero of the air-thermometer was further improved on by Johann Lambert (Pyrometrie, 1779), who gave the value –270° and observed that this temperature might be regarded as absolute cold.”— Anon (1911), Encyclopedia Britannica (§:Cold)
“Amontons seems to have been the first to realize the importance of actually measuring the thermal expansion of elastic fluids, and the first to have studied the increase of pressure with temperature. Amontons also noticed, as Halley had done, that when water boils the temperature remains constant. Unlike Halley, he seems to have recognized the importance of this: boiling water provides an eminently suitable datum or fixed point for a thermometric scale.”— Donald Cardwell (1971), From Watt to Clausius (pgs. 18-19)
“Amontons, who had been deaf since childhood, invented and perfected various scientific instruments. In 1687 he made a hygrometer (an instrument for measuring moisture in the air), in 1695 he produced an improved barometer, and in 1702-03 a constant-volume air thermometer. In 1699 he published the results of his studies on the effects of change in temperature on the volume and pressure of air. He noticed that equal drops in temperature resulted in equal drops in pressure and realized that at a low enough temperature the volume and pressure of the air would become zero -an early recognition of the idea of absolute zero. These results lay largely unnoticed and the relationship between temperature and pressure of gases was not reexamined until the next century (by scientists such as Jacques Charles). Amontons also published in 1699 the results of his studies on friction, which he considered to be proportional to load.”— John Daintith (1994), Biographical Encyclopedia of Scientists (pg. 18)
“The macroscopic laws of friction (Ѻ) found in textbooks were first published by the French engineer Amontons about 300 years ago, albeit the first recorded studies go back even further to the Italian genius da Vinci. Both found that the friction F between two solid bodies, firstly is independent of the apparent area of contact, and secondly is proportional to the force normal L or load that pushes the two objects together.”— Martin Muser (2003), “Statistical Mechanics of Static and Low-Velocity Kinetic Friction” (pg. 190)
“Although Guillaume Amontons, the son of a lawyer from Normandy, had no format scientific education, he nevertheless studied geometry and the sciences and made important contributions in physics and meteorology. Amontons became deaf at an early age white in a Paris Latin school but was not deterred by this handicap. He went on to design many scientific instruments, such as a hygrometer (1687), an improved barometer (1688), an optical telegraph (1688-95), a conical nautical barometer (1695), a thermometer (1699), and various air and liquid thermometers including a constant-volume air thermometer (1702). As a career, however, he worked in government on various public works projects as an engineer.”— Don Rittner (2014), A to Z of Scientists in Weather and Climate [8]