Handbook for rural school trustees . vered supply tank having a bubbler in-serted on the side near the bottom. In such a tank whenrelease is made the water bubbles up by force of question of keeping the water cool, of keeping a goodsupply in the tank, of keeping the dust out, of getting ridof waste water, all arise when such a tank is used. Theteacher must solve these questions. The most satisfactorymeans that the writer knows of insuring children gooddrinking water comes from the use of a system as shownin the accompanying cut. In using this system with a driven well an excavation
Handbook for rural school trustees . vered supply tank having a bubbler in-serted on the side near the bottom. In such a tank whenrelease is made the water bubbles up by force of question of keeping the water cool, of keeping a goodsupply in the tank, of keeping the dust out, of getting ridof waste water, all arise when such a tank is used. Theteacher must solve these questions. The most satisfactorymeans that the writer knows of insuring children gooddrinking water comes from the use of a system as shownin the accompanying cut. In using this system with a driven well an excavationcan be easily made at the top of the well large enough tocontain the tank, etc. An ideal arrangement with such asystem would be to have the bubbler located in the school-room with the supply pipe leading underground to the tankin the well. With a larger supply tank the water could beused for other purposes than drinking. The description ofthe working of the system shown in the cut is as follows: 24 HANDBOOK FOR RURAL SCHOOL TRUSTEES. By operating the pump handle the water is forced in atthe bottom of the presure tank, thus compressing the air atthe top of the tank. With each stroke of the pump handlethe tank receives more water, and the air at the top is morecompressed. A check valve placed between the pump andthe tank relieves the pump from all back pressure. A self-closing valve is placed between the pressure tank and thesupply pipe leading to the bubbling cup. To get a drink ofwater the child turns the little handwheel at the side of thebowl, which opens the valve below. The air pressure in thetank forces the water to bubble up through the bubblingcup. In the course of the process the wastewater escapesthrough the outer pipe at R and out through the pipe will be necessary to make these waste pipes water-tight,so that none of the waste water would fall back into thewell. The waste pipe shown at T should be carried to asafe distance from the well, so as to prevent any pos
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