. A treatise on hygiene and public health . oughIf, into the room, andsinks; the warm air of theroom rises through theopening, S, into the shaft,where it passes through Dinto an attic story, whenceit is discharged into theouter air. It is, perhaps,questionable whether thedraught produced by the natural difference of temperature is adequate tothe task exacted of it. A more active circulation is produced by lettingthe air enter at C instead of IT. In Fig. 31 the winter system is given. The heated air enters the roomat the top, H, and leaves at C, after parting with some of its heat. Theejection
. A treatise on hygiene and public health . oughIf, into the room, andsinks; the warm air of theroom rises through theopening, S, into the shaft,where it passes through Dinto an attic story, whenceit is discharged into theouter air. It is, perhaps,questionable whether thedraught produced by the natural difference of temperature is adequate tothe task exacted of it. A more active circulation is produced by lettingthe air enter at C instead of IT. In Fig. 31 the winter system is given. The heated air enters the roomat the top, H, and leaves at C, after parting with some of its heat. Theejection of the air is effected by simply letting it rise through D by virtueof its levity. The principle is perfectly correct, provided the air outsideis enough colder than that inside; but that being a very variable factor,the force of the draught must vary also with the weather. The argu-ments for the necessity of an artificial heating of the draught-chimneyare given elsewhere. In Fig. 32 the school is dismissed and the room closed. The fire may. Fig. rJ9. -Ventilation of the Annen-Realschule in Dres-den (summer). 16 THE ATMOSPHERE.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthygiene, bookyear1879
