. The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools . sh air. Liv-ing in closed rooms byday and sleeping with-out windows raised atnight is a gentle way ofcommitting suicide. How to Ventilate. —Since the flow of coldair upon the body may make one ill, the fresh Fig. 105.—Expeiiiueut in ventilation. A, ?, • 1 i pane of alass forms the front side of the air must have miets ^^^where it will not strike directly on any one in the room. Two or three windowsall on one side of the room, pulled down several inchesfrom the top
. The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools . sh air. Liv-ing in closed rooms byday and sleeping with-out windows raised atnight is a gentle way ofcommitting suicide. How to Ventilate. —Since the flow of coldair upon the body may make one ill, the fresh Fig. 105.—Expeiiiueut in ventilation. A, ?, • 1 i pane of alass forms the front side of the air must have miets ^^^where it will not strike directly on any one in the room. Two or three windowsall on one side of the room, pulled down several inchesfrom the top and raised a few inches at the bottom, affordexcellent ventilation. If a board, slanting inward, isplaced in the bottom of the window so as to directthe current of air upward, no draft will usually befelt, even by those within a few feet of the height of the board should be twice as great asthe opening in the window, and triangular pieces at theends will shut out the current tending to enter there. To show clearly how to ventilate, a box with a smalllighted candle, as in Figure 105, may be used. The candle. 158 Alii A^sD HEALTH uses up oxygen, makes heat, and gives off carbon dioxidein the same way that people do. Four half-inch holes,bored in each end of a box with a capacity of 400 cubic inches, are fitted with corks o\ ^Z a o\ S ^^ ^^ \ \ \ and a pane of glass servesfor one side. By removingthe corks from one groupof holes at a time, it iseasy to determine whichsupplies the larger amountof air, as the candle flamegoes up and down accord-ing to the amount of oxy-gen and carbon dioxidepresent. With all thecorks in, the candle. is ex-tinguished in one two corks on the sameend at the top are removed,the candle will burn twominutes. The removal of Fig. 106.—Diagram sliowing how to the twO COlks at the top in open the wmdows so that all pupils j^oth ends allows the Candle may have fresh air. The course ^^ -i i the air currents were determined by tO DUr
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecthygiene, booksubjectp
