Page:Reflections on the Motive Power of Heat.djvu/59



III.

REFLECTIONS ON THE MOTIVE-POWER OF HEAT, AND ON MACHINES FITTED TO DEVELOP THAT POWER.

one knows that heat can produce motion. That it possesses vast motive-power no one can doubt, in these days when the steam-engine is everywhere so well known. To heat also are due the vast movements which take place on the earth. It causes the agitations of the atmosphere, the ascension of clouds, the fall of rain and of meteors, the currents of water which channel the surface of the globe, and of which Rh