Siphon

—1. A pipe bent in the form of U or N acting on the principle of the hydrostatic balance, so that the pre ure of water in one leg always tends to equalize that in the other. 2. A bent tube or pipe with limbs of unequal length for transferring liquids from a barrel or other receptacle. The action of the instrument is due to the difference in weight of the liquid in the two legs. 3. A U shaped tube fitted to steam gauges, etc., so that nothing but water shall enter the gauge.