A Catechism of the Steam Engine: Illustrative of the Scientific Principles Upon Which Its Operation Depends, and the Practical Details of Its ... Railways; With Various Suggestions of Improve - Softcover

Inhaltsangabe

Excerpt from A Catechism of the Steam Engine: Illustrative of the Scientific Principles Upon Which Its Operation Depends, and the Practical Details of Its Structure, in Its Application to Mines, Mills, Steam Navigation and Railways; With Various Suggestions of Improvement

A. - Because it is not the vacuum which exerts this pressure, but the atmosphere, which, like a head of water, presses on every thing immerged beneath it. A head of water, however, would not press down a piston, if the water were admitted on both its sides; for an equilibrium would then be established, just as a balance retains its equilibrium though an equal Weight be added to each scale; but take the weight out of one scale, or empty the water from one side of the piston, and motion or pressure is produced; and in like manner pressure is produced on a piston by admitting steam or air upon the one side, and withdrawing the steam or air from the other side. It is not, therefore, to a vac uum, but rather to the existence of an unbalanced plenum, that the pressure made manifest by exhaustion is due, and every one knows that a vacuum of itself would not work an engine.

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