Hydrostatics and pneumatics / [Dionysius Lardner].

  • Dionysius Lardner
Date:
1831
Catalogue details

Licence: Public Domain Mark

Credit: Hydrostatics and pneumatics / [Dionysius Lardner]. Source: Wellcome Collection.

    344/376 (page 328)
    through an intermediate channel or pipe, which rises above the natural level of the water. Let D, fig. 43., be a cistern containing a liquid, and Fig. 43. et B be the height over which it is necessary to conduct that liquid. Let A B C be a bent tube open at both ends, and let the leg B A be immersed in the liquid which it is required to transfer, and let the end C be directed into the vessel to which it is intended to remove Let the air which fills the tube DBC be drawn from it hy the mouth applied at C, or by an exhausting syringe. The atmospheric pressure immediately taking effect on the surface D of the water in the cistern will press the water into the tube A B, towards the point B ; and if the point B be not at a greater height above the level of the cistern than 32 feet, then the water will rise to the highest point B, and will flow so as to fill the entire tube to the mouth C. To comprehend the principle upon which the siphon acts, let us suppose the water at the point B acted upon by two pressures, one towards C, and the other towards D. It will move in the one direction or in the other according as the one or the other pressure prevails. The atmospheric pressure acting on the surface D sup- ports the column in the siphon between the surface and