Automatic siphonic apparatus as used in sewerage systems and in sewage purification plants . out of the weir chamber* This allows the air to enter tliedischarging limb thus venting the sijjhon and preparing it forthe next rise of water in the tank* This style of siphon has several objectionable features*First of all, it is necessary that the sijihon be air tight, andit is a difficult matter to bolt the several pieces together andhave the joints absolutely tight* Again all foreign matter mustbe excluded from the tank otherwise the auxiliary siphon wouldbe likely to clog up and thus prevent the
Automatic siphonic apparatus as used in sewerage systems and in sewage purification plants . out of the weir chamber* This allows the air to enter tliedischarging limb thus venting the sijjhon and preparing it forthe next rise of water in the tank* This style of siphon has several objectionable features*First of all, it is necessary that the sijihon be air tight, andit is a difficult matter to bolt the several pieces together andhave the joints absolutely tight* Again all foreign matter mustbe excluded from the tank otherwise the auxiliary siphon wouldbe likely to clog up and thus prevent the main siphon fromoperating* It is also necessary to be very particular in settingthe siphon, for should the crest of the weir be below the bottomof the discharging limb the latter would never be sealed* Theobjections were too pronounced to overcome. This form of siphonwas used in many places and for a time seemed fairly satisfactory,but as simpler types were put upon the market the demand for itdecreased and at the present writing it is no longer used. /=^L/irE FIELD-WARING THE VAK VRMKEN SIPHON, The Van Vranken was one of the few foriQS of Blphon depend^ing upon moving parts for its operation, which met with any de-gree of Bucceee. As is shown in the drawing on Plate II. thesiphon consists of eiphon leg, a tilting pan, fnid a cast ironbox connecting with the sewer. The siphon log is bolted to theoast iron box, and the tilting pan or trap instead of beingfixed is hung on bearings under the siplion leg and is so balancedthat when it is nearly filled its center of gravity moves forward,the pan tilts over, end a portion of the water is spilled out*The water in the tank has previously risen to a height above thelower bed of the siphon leg equal in amoimt to the depth of waterin the tilting pan and thus the two coliams of water were keptin equilibrium. The sudden opilling of water from the tiltingpan destroys tJiis equilibrium and causes the long leg of thesiphon to be
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectsewerage, bookyear190
