. Lessons in nature study. Nature study. 88 NATURE STODY iroiu the lighted strip produces currents in the air. This makes it necessary to manage the smoke paper so that the smoke at some distance from the burning part is allowed to fall in the way of the currents to be tested. The condition of the air about a stove, a radiator, or a register is next to be explored. The same tests may be applied to the air about a person sitting quietly in a room. These experiments will reveal the fact that in a closed room where all else is quiet, the air in all parts is in constant mo- tion, the motion being
. Lessons in nature study. Nature study. 88 NATURE STODY iroiu the lighted strip produces currents in the air. This makes it necessary to manage the smoke paper so that the smoke at some distance from the burning part is allowed to fall in the way of the currents to be tested. The condition of the air about a stove, a radiator, or a register is next to be explored. The same tests may be applied to the air about a person sitting quietly in a room. These experiments will reveal the fact that in a closed room where all else is quiet, the air in all parts is in constant mo- tion, the motion being caused by some of it being heated more than the rest. Next allow the pupils to open the windows at the top and at the bottom and find out at which points the air is entering and at which it is escaping from the room. Various combinations of opening and closing of the different windows may be studied as well as the conditions with doors partially or wholly open, also with other openings which may be in the room. These experiences making familiar the movements of air and their cause form a good basis for study of both ventilation of rooms and of means ot the greater movements of air outside in thephenomenaof Ventilation in a miuiature room. Beside the study of a real room in reference to its ventilation, which of course is the best subject, the matter can be further. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Jenkins, Oliver Peebles; Kellogg, Vernon L. (Vernon Lyman), 1867-1937. joint author. San Francisco, The Whitaker & Ray Company
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