. Principles and practice of plumbing . a matter of fact, however, in practice it isdoubtful if the water could be raised a greater height than25 feet, and even that would be an extreme lift. Twentyto twenty-two feet would probably be more nearly the liftof a siphon under usual working conditions. Application of Siphonage to a Fixture Trap.—InFig. 24 is shown another form of siphon. This does notdiffer so much from the first one shown, outside of the factthat instead of lifting the water over the top edge of thevessel it takes it out of the side near the bottom, then turnsupward to near the to
. Principles and practice of plumbing . a matter of fact, however, in practice it isdoubtful if the water could be raised a greater height than25 feet, and even that would be an extreme lift. Twentyto twenty-two feet would probably be more nearly the liftof a siphon under usual working conditions. Application of Siphonage to a Fixture Trap.—InFig. 24 is shown another form of siphon. This does notdiffer so much from the first one shown, outside of the factthat instead of lifting the water over the top edge of thevessel it takes it out of the side near the bottom, then turnsupward to near the top of the vessel, or higher accordingto the use to which it is to be put, then forms the well-known U-shaped tube which is the distinguishing feature ofthe common siphon. The resemblance here to a commongiphon trap is shown by means of dotted lines. If insteadof the vessel of water the part of the tube shown by dottedlines be supplied, w^ haye a trap such as is used under Digitized by Microsoft® Principles and Practice of Plumbing 51. Fig. 24Half S Sipbon plumbing fixtures, and the reason it can be siphoned be-comes apparent. When the long leg of the siphon becomesfilled with water, it. will draw the water out of the dip ofthe trap until the water line is lowered enough to allow airto flow in and break the siphonage, just as it would if in-stead of a trap, it were a commonvessel that the siphon was attach-ed to. The principle of ventilation offixture traps can be clearly under-stood by referring to Fig. 25. Aswas previously pointed out, the leastlittle pin hole at the crown of thesiphon, or in the long leg of thesiphon, above the bottom of the shortleg, will permit enough air to enterthe pipe to destroy the siphonic ac-tion. That fact is taken advantageof to protect traps from being siphoned in plumbing sys-tems. If, for instance, a pet-cock were placed in the crownof a trap, as shown in the illustration, when the cock isclosed the trap would form a true siphon; but the momen
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