Public works . rity of these of the designs call for a scum board at the in-fluent and effluent ends about 2 feet from the is not wise to place the scum board too close to theweirs as the increase in velocity at this point maydraw some of the floating material over into theeffluent. Slots: It is believed that the tj-pe of slot rec-ommended by Mr. Hammond is a decided improve-ment over the old design. In the former design oneiir both planes of the sloping sides walls of the set-tling chamber were obstructed, but in this design an??.-V shaped gas deflector has its upper surfa
Public works . rity of these of the designs call for a scum board at the in-fluent and effluent ends about 2 feet from the is not wise to place the scum board too close to theweirs as the increase in velocity at this point maydraw some of the floating material over into theeffluent. Slots: It is believed that the tj-pe of slot rec-ommended by Mr. Hammond is a decided improve-ment over the old design. In the former design oneiir both planes of the sloping sides walls of the set-tling chamber were obstructed, but in this design an??.-V shaped gas deflector has its upper surface in the: Tme plane as the slopes of the settling chamber,allowing a free fall into the lower compartment,.-everal plants have slots constructed in such a man-ner in New Jersey. These plants have causednoticeably less trouble in cleaning the side such a design it may be possible to use a 6-inchslot with success, but our experience in New Jersey,where the majority of slots are 6 inches, would in-. CHIMNET TYPE OF GAS VENTS 60 PUBLIC WORKS Vol. 52, No. 4 dicate that a slot 8 inches in width is advisable. Thegas deflector or bottom of the sloping side walls ofthe settling chamber should be so constructed as notto interfere or hold back any sludge in the processof rising or falling. At Princeton it is believedthat the peculiar construction of the bottom of theside walls and gas deflector catches much sludge andholds it in suspension. Gas Vents and Sciini Chambers: There areseveral different forms of gas vents; the mos:popular of these being the longitudinal rectang-ular gas vents, the chimney gas vents and the seg-ment gas vents. The form bears a close relation tothe area, which has been much discussed by engi-neers. Some think that it should be as small as pos-sible and the chimney as well as the segment typeillustrates the practical application of this engineers advocate very large gas vents. in this state would indicate that longi-tudinal gas v
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
