Hydrostatics and pneumatics / [Dionysius Lardner].

  • Dionysius Lardner
Date:
1831
Catalogue details

Licence: Public Domain Mark

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

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    C to any higher level as L, then the weight of the water in the leg below L will be balanced by the pressure of the water in the vessel F G, and, therefore, the efficient leg of the siphon will be B L. Thus, as the surface of Fig. 43. the water rises in the vessel F G, the actual leg of the siphon is shortened. When the surface L has risen towards the level of the surface D, then the legs of the siphon become equal, and, by what has been already stated, its action must cease. It thus'appears that the siphon is merely an instru- ment used in decanting a liquid, but that it does not perform the office of a pump in raising it above the level which it held in the vessel from which it is drawn. The process of exhausting the syringe by suction, or otherwise, is frequently difficult and always inconvenient. But this may be avoided by presenting the legs of the siphon upwards in the first instance, and having stopped the shorter leg with the hand, filling the siphon through the longer leg C B. Both ends of the tube being then stopped, let them be pressed downwards, the shorter leg being introduced below the water in the cistern, and the longer leg being carried over the vessel in which the liquid is to be decanted. The process of exhaustion is sometimes facilitated in