Automatic siphonic apparatus as used in sewerage systems and in sewage purification plants . he difference of level between the water in thetsunk ajid the water in the bell. Thus the two columns are inequilibrium. As soon as the depth of water in the tank is in-creased by a further supply, no matter how small, some of the airwill be forced around the lower bend of tlie trap. By this upwardrush of air some of the water in the short leg is thrown destroys the equilibrium between the two columns of waterand allows tJie long leg of the siphon to suddenly become filled 11 with water, which
Automatic siphonic apparatus as used in sewerage systems and in sewage purification plants . he difference of level between the water in thetsunk ajid the water in the bell. Thus the two columns are inequilibrium. As soon as the depth of water in the tank is in-creased by a further supply, no matter how small, some of the airwill be forced around the lower bend of tlie trap. By this upwardrush of air some of the water in the short leg is thrown destroys the equilibrium between the two columns of waterand allows tJie long leg of the siphon to suddenly become filled 11 with water, which brings the siphon into immediate operation. The free projection of the short leg of the trap, givesthe water thrown up by the air a chance to escape over its sideand down the sewer* In the ordinary siphon this water would fallback in the short leg of the trap sind so choke the operation. The siphon draws the water from the tank until thebottom of the bell is reached. The action ceases and the siphonvents througji a 3/8 sniff hole, which is bored about two inchesabove the bottom of DESIGN AND CONSTRUCTION. What ia known as the Killer Standard Deeigjn Siphon, shownin Plate VII. is made in four sizes, the diameter of the trapindicating the size, it being in four cases, three, five, sixand eight inches. These siphons discharge at depths of 18, 27,36 and 42 Inches, measured from the bottom of the tank to thehigh water line. These depths are governed by the differentproportions of the sij^on, but mainly by the depth of the trap A,this depth may be varied two or three inches by raising or lower-ing the sniff hole in the bell» The actual depth can be veryclosely determined and in order to bring out the several points,the discharging depth of a 6 Miller siphon will be computed. The cut on Plate VII. shows the siphon just about todischarge. At the beginning of the action there is no water inthe tank or bell and the water level A is the same in both legsof the trap. When th
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectsewerage, bookyear190
