A siphon is a bent tube, having one branch longer than the other, as is represented in [Fig. 15].
Fig. 15.
For what is the siphon used?
The siphon is used to draw liquids from one vessel into another.
How can water be drawn from a vessel by means of a siphon?
Put the short branch in the water, then, by means of the mouth applied to the long branch, suck the air from it, and the water will begin immediately to flow from the long branch.
Where must the open end of the short branch be kept?
It must be kept beneath the surface of the water, so as to prevent air from entering the tube.
Where must the open end of the long branch be kept?