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Show Gi for Air Furtaoatioti. ' Gai jets may be made important auxiliaries aux-iliaries to ventilation. Inserted ia the bottom ot air shafts, they establish active currents which withdraw the vitiated air. A. cubio foot of illuminating gas can be utilized so as to cause the discharge dis-charge of 1,000 cubio foet of air, and a common gas burner will consume nearly three feet of gas an hour, so that the quantity of contaminated air that would be extracted from an apartment duriug that time would be 8,000 feet. By suitable suit-able t-ontrivaais gaa lights, the effects ot which are but too ofteu pernicious, may uot only become self venliliuiDg, but may be also umdtf to contribute materially ma-terially to the purification of the air of inhabited apartments. New York Tele-jratu. |