Then the vitiated air is drawn off through
registers both at the top and bottom of the room, opening into a heated
exhausting flue, through which the constantly ascending current of
warm air carries it off. These heated coils are often used for warming
houses without any arrangement for carrying off the vitiated air, when,
of course, their peculiar usefulness is gone.
The moisture may be supplied by a broad vessel placed on or close to
the heated coils, giving a large surface for evaporation. When rooms
are warmed chiefly by radiated heat, the air can be borne much cooler
than in rooms warmed by hot-air furnaces, just as a person in the
radiating sun can bear much cooler air than in the shade. A time will
come when walls and floors will be contrived to radiate heat instead
of absorbing it from the occupants of houses, as is generally the case
at the present time, and then all can breathe pure and cool air.
We are now prepared to examine more in detail the modes of warming and
ventilation employed in the dwellings planned for this work.
In doing this, it should be remembered that the aim is not to give
plans of houses to suit the architectural taste or the domestic
convenience of persons who intend to keep several servants, and care
little whether they breathe pure or bad air, nor of persons who do not
wish to educate their children to manual industry or to habits of close
economy.
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