Mechanical Contracting & Plumbing January-December 1909 . ssure, be it , or 75 pounds, is obtained. After obtaining the desired pressureon the gauge, it will be apparent thatall of the air originally contained in thetank will be at the top and all of thewater pumped into it will be at the bottorn, and that the former will occupya space decreasing in volume as the supply, the water cannot be contaminat-ed after it enters the tank, and thedanger due to leakage is reduced to aminimum. In Fig. 2 is shown a system in whichthe tank is buried in the earth withthe object of keeping the water cool
Mechanical Contracting & Plumbing January-December 1909 . ssure, be it , or 75 pounds, is obtained. After obtaining the desired pressureon the gauge, it will be apparent thatall of the air originally contained in thetank will be at the top and all of thewater pumped into it will be at the bottorn, and that the former will occupya space decreasing in volume as the supply, the water cannot be contaminat-ed after it enters the tank, and thedanger due to leakage is reduced to aminimum. In Fig. 2 is shown a system in whichthe tank is buried in the earth withthe object of keeping the water coolerthan would be possible with it kept inthe basement, or because there may notbe room in the latter place, but such anarrangement in some soils would neces-sitate a careful protection of the tankor the results might be the more or lesarapid deterioration of the metal. Itwill be noted that one pipe serves bothto deliver water to the tank and to re-turn it to the house, and it will be cleavthat this will do equally as well as twopipes, as shown in Fig. water in the tank will not be forced must be borne in mind that a tankthat will be found water-tight or steam-tight, may not be air tight, for the samereason that a waste basket that would pressure increases, that is to say, themore water that is pumped into the tankthe smaller will be the space into whichthe air will be will also be evident that when a In Fig, 3 is shown an arrangement bymeans of which a soft water and hardwater tank may be filled alternately withthe one pumping apparatus. By thisarrangement of pipe lines it is only 9 PLUMBER AND STEAM FITTER April 1909 necessary to turn in the proper direc-tion the two three-way cocks indicatedin the diagram. In Fig. 4 is shown a duplicate watersystem for hard and soft water oper-ated by a small gasolene engine con-nected by a pump to an ordinary hand-force pump, which may be manuallyoperated should necessity at any timerequire it. This outfit, together with
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