. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. forced in, dis-placing the air already in the building, theterm propxdsion is used. These terms areanalogous to the terms aspiration and perfla-tion, already referred to in connection withthe action of winds. Extraction is accomplished by means ofheat, steam-jets, fans, wheels, pumps, or theArchimedean screw. The action of heal has been explained whenspeaking of the positions of outlets and thedistribution of air. In the cases referred to,fire is placed at the bo
. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. forced in, dis-placing the air already in the building, theterm propxdsion is used. These terms areanalogous to the terms aspiration and perfla-tion, already referred to in connection withthe action of winds. Extraction is accomplished by means ofheat, steam-jets, fans, wheels, pumps, or theArchimedean screw. The action of heal has been explained whenspeaking of the positions of outlets and thedistribution of air. In the cases referred to,fire is placed at the bottom of a chimney ;flues with steam-coils or jets of gas are usedfor the same purpose. Sometimes the heat-ing power is placed near the top of the flueor chimney ; this is a bad plan, as the hot airescapes after acting upon a short section ofthe chimney instead of the whole length. Inchurches, public halls, and other buildingswhere numerous gas-jets are employed forlighting purposes, they might more frequently be takenadvantage of for ventilating, instead of being allowed tovitiate the atmosphere. Those who have had occasion to. ?heet-metal Flue connecting with the Stove-pipe. 624 REFERENCE HANDBOOK OF THE MEDICAL SCIENCES. visit a printing-office at night can testify to the unwhole-some condition of the atmosphere, especially if the visi-tor has come into the office directly from the fresh outerair when the office is in full blast. There is a gas-jet toevery compositor, or, at least, to every two compositors ;each of these jets vitiates the atmosphere about as muchas two men. The workmen usually have a choice be-tween chilling draughts and a terribly vitiated atmos-phere. If a small funnel (which would also reflect thelight downward) were placed mouth downward over eachjet, with a piece of inch-tube running upward from theapex, these several tubes connecting with a larger centraltube, and this with the outer air, a vast change would beeffected. Steam je
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmedicine, bookyear188
