. Elementary physics and chemistry: second stage. Science. ELEMENTARY PHYSICS AND CHEMISTRY. the pipes ab^ etc., and the coils C, C, are nearly full of cold water and that the fire below the boiler is lighted. Heat passes through the bottom of the boiler by the process of conduction, and heats the layer of water near it, which, expanding, rises and passes up the tube ab to the top of the building, where it gives out its heat to the rooms. The place of this water which has thus risen is taken by cold water from the other pipe, terminat- ing just past d. This in its turn gets warmed and rises, a
. Elementary physics and chemistry: second stage. Science. ELEMENTARY PHYSICS AND CHEMISTRY. the pipes ab^ etc., and the coils C, C, are nearly full of cold water and that the fire below the boiler is lighted. Heat passes through the bottom of the boiler by the process of conduction, and heats the layer of water near it, which, expanding, rises and passes up the tube ab to the top of the building, where it gives out its heat to the rooms. The place of this water which has thus risen is taken by cold water from the other pipe, terminat- ing just past d. This in its turn gets warmed and rises, and its place is taken by the water which has become cold by its passage through the pipes in the various rooms. There is thus no difference in this case from what you have seen to be true in the flask of water being heated from below. Ventilation.—The ventilation of ordinary dwelling rooms is easily possible because of the way in which gases become heated by convection. The air in a room becomes warm and rendered impure at the same time. Consequently there is a tendency for the impure air to rise, and if a suitable place near the ceiling is made for it to get out, as well as a place near the floor for the. 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 Gregory, R. A; Simmons, A. T. London: MacMillan
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