. The Ontario high school physics. Fig. 292.—Cryophorus. CHAPTER XXX. Heat and Mechanical Motion 302. Mechanical Equivalent of Heat. We have referred(§ 241) to fclie fact that during the first half of the nineteenth century the kinetic theory ofheat, advocated by Count Rum-ford and Sir Humphry Davy,gradually superseded the oldmaterialistic conception. Themodern theory was regarded asestablished when Joule, aboutthe middle of the centiny, de-monstrated that for every unitof mechanical energy whichdisappears in the transformationof mechanical motion into heat adefinite and constant quantity ofhe
. The Ontario high school physics. Fig. 292.—Cryophorus. CHAPTER XXX. Heat and Mechanical Motion 302. Mechanical Equivalent of Heat. We have referred(§ 241) to fclie fact that during the first half of the nineteenth century the kinetic theory ofheat, advocated by Count Rum-ford and Sir Humphry Davy,gradually superseded the oldmaterialistic conception. Themodern theory was regarded asestablished when Joule, aboutthe middle of the centiny, de-monstrated that for every unitof mechanical energy whichdisappears in the transformationof mechanical motion into heat adefinite and constant quantity ofheat is developed. The value ofthe heat unit expressed in unitsof mechanical energy is calledthe mechanical equivalent of heat. 303. Determination of the Mechanical Equivalent of Heat. The essential features of Joules apparatus for determiningthe mechanical equivalent of heatare illustrated in Fig. 293. Apaddle-wheel was made to revolvein a vessel of water by a fallingweight connected with it by pulleysand cords. Joule measured theheat produced by the motion ofthe p
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